{"kind": "product", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "name": "ckeditor3", "product": "ckeditor3", "ecosystem": "Ubuntu:18.04:LTS", "items": [{"id": "CVE-2026-28343", "noindex": false, "published": "2026-03-05T19:42:58.372Z", "modified": "2026-03-19T18:45:43.135Z", "cvss": 6.4, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "severity": "medium", "epss": 0.00284, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-28343", "title": "CKEditor: Cross-site scripting (XSS) in the HTML Support package", "description": "CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. Starting in version 29.0.0 and prior to version 47.6.0, a cross-site scripting (XSS) vulnerability has been discovered in the General HTML Support feature. This vulnerability could be triggered by inserting specially crafted markup, leading to unauthorized JavaScript code execution, if the editor instance used an unsafe General HTML Support configuration. This issue has been patched in version 47.6.0.", "references": ["https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-jrqm-vmqc-gm93", "https://github.com/ckeditor/ckeditor5/releases/tag/v29.0.0", "https://github.com/ckeditor/ckeditor5/releases/tag/v47.6.0"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}, {"id": "CVE-2025-61261", "noindex": false, "published": "2025-11-07T00:00:00.000Z", "modified": "2025-11-07T19:28:12.951Z", "cvss": 5.4, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "severity": "medium", "epss": 0.00285, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2025-61261", "title": "CVE-2025-61261", "description": "A reflected cross-site scripting (XSS) vulnerability in CKeditor v46.1.0 & Angular v18.0.0 allows attackers to execute arbitrary code in the context of a user's browser via injecting a crafted payload.", "references": ["https://github.com/ckeditor/ckeditor5/releases/tag/v46.1.0", "https://senscybersecurity.nl/cve-2025-61261-explained/", "https://nvd.nist.gov/vuln/detail/CVE-2025-61261"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}, {"id": "CVE-2025-25299", "noindex": false, "published": "2025-02-20T19:23:03.013Z", "modified": "2025-02-20T19:47:33.534Z", "cvss": 2.3, "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N", "severity": "low", "epss": 0.00603, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2025-25299", "title": "Cross-site scripting (XSS) in the real-time collaboration package", "description": "CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. During a recent internal audit, a Cross-Site Scripting (XSS) vulnerability was discovered in the CKEditor 5 real-time collaboration package. This vulnerability affects user markers, which represent users' positions within the document. It can lead to unauthorized JavaScript code execution, which might happen with a very specific editor and token endpoint configuration. This vulnerability affects only installations with Real-time collaborative editing enabled. The problem has been recognized and patched. The fix is available in version 44.2.1 (and above). Users are ad", "references": ["https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-j3mm-wmfm-mwvh", "https://ckeditor.com/docs/ckeditor5/latest/features/collaboration/real-time-collaboration/real-time-collaboration.html", "https://github.com/ckeditor/ckeditor5/releases/tag/v44.2.1"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}, {"id": "CVE-2024-45613", "noindex": false, "published": "2024-09-25T13:27:03.546Z", "modified": "2024-10-01T21:20:44.633Z", "cvss": 5.1, "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N", "severity": "medium", "epss": 0.00524, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2024-45613", "title": "CKEditor 5 has Cross-site Scripting vulnerability in the clipboard package", "description": "CKEditor 5 is a JavaScript rich-text editor. Starting in version 40.0.0 and prior to version 43.1.1, a Cross-Site Scripting (XSS) vulnerability is present in the CKEditor 5 clipboard package. This vulnerability could be triggered by a specific user action, leading to unauthorized JavaScript code execution, if the attacker managed to insert a malicious content into the editor, which might happen with a very specific editor configuration. This vulnerability only affects installations where the Block Toolbar plugin is enabled and either the General HTML Support (with a configuration that permits unsafe markup) or the HTML Embed plugin is also en", "references": ["https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-rgg8-g5x8-wr9v", "https://github.com/ckeditor/ckeditor5/releases/tag/v43.1.1", "https://nvd.nist.gov/vuln/detail/CVE-2024-45613"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}, {"id": "CVE-2024-43411", "noindex": false, "published": "2024-08-21T15:17:24.176Z", "modified": "2024-08-22T13:51:02.904Z", "cvss": 3.1, "cvss_vector": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:N", "severity": "low", "epss": 0.00427, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2024-43411", "title": "CKEditor4 has a low risk cross-site scripting (XSS) vulnerability from domain takeover", "description": "CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A theoretical vulnerability has been identified in CKEditor 4.22 (and above). In a highly unlikely scenario where an attacker gains control over the https://cke4.ckeditor.com domain, they could potentially execute an attack on CKEditor 4 instances. The issue impacts only editor instances with enabled version notifications. Please note that this feature is disabled by default in all CKEditor 4 LTS versions. Therefore, if you use CKEditor 4 LTS, it is highly unlikely that you are affected by this vulnerability. If you are unsure, please contact us. The fix is available in ver", "references": ["https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-6v96-m24v-f58j", "https://github.com/ckeditor/ckeditor4/commit/b5069c9cb769ea22eae1cbd7200f22b1cf2e3a7f", "https://nvd.nist.gov/vuln/detail/CVE-2024-43411"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}, {"id": "CVE-2024-24816", "noindex": false, "published": "2024-02-07T16:58:24.564Z", "modified": "2024-08-01T23:28:12.611Z", "cvss": 6.1, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "severity": "medium", "epss": 0.01652, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2024-24816", "title": "Cross-site scripting (XSS) vulnerability in samples with enabled the preview feature", "description": "CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A cross-site scripting vulnerability vulnerability has been discovered in versions prior to 4.24.0-lts in samples that use the `preview` feature. All integrators that use these samples in the production code can be affected. The vulnerability allows an attacker to execute JavaScript code by abusing the misconfigured preview feature. It affects all users using the CKEditor 4 at version < 4.24.0-lts with affected samples used in a production environment. A fix is available in version 4.24.0-lts.", "references": ["https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-mw2c-vx6j-mg76", "https://github.com/ckeditor/ckeditor4/commit/8ed1a3c93d0ae5f49f4ecff5738ab8a2972194cb", "https://ckeditor.com/cke4/addon/preview"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}, {"id": "CVE-2024-24815", "noindex": false, "published": "2024-02-07T15:14:32.361Z", "modified": "2025-02-13T17:40:30.582Z", "cvss": 6.1, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "severity": "medium", "epss": 0.00706, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2024-24815", "title": "CKEditor4 Cross-site scripting (XSS) vulnerability caused by incorrect CDATA detection", "description": "CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A cross-site scripting vulnerability has been discovered in the core HTML parsing module in versions of CKEditor4 prior to 4.24.0-lts. It may affect all editor instances that enabled full-page editing mode or enabled CDATA elements in Advanced Content Filtering configuration (defaults to `script` and `style` elements). The vulnerability allows attackers to inject malformed HTML content bypassing Advanced Content Filtering mechanism, which could result in executing JavaScript code. An attacker could abuse faulty CDATA content detection and use it to prepare an intentional at", "references": ["https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-fq6h-4g8v-qqvm", "https://github.com/ckeditor/ckeditor4/commit/8ed1a3c93d0ae5f49f4ecff5738ab8a2972194cb", "https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_dtd.html#property-S-cdata"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}, {"id": "CVE-2023-4771", "noindex": false, "published": "2023-11-16T14:08:47.418Z", "modified": "2024-10-01T14:50:24.839Z", "cvss": 6.1, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "severity": "medium", "epss": 0.00878, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2023-4771", "title": "Cross-Site Scripting vulnerability in CKSource CKEditor", "description": "A Cross-Site scripting vulnerability has been found in CKSource CKEditor affecting versions 4.15.1 and earlier. An attacker could send malicious javascript code through the /ckeditor/samples/old/ajax.html file and retrieve an authorized user's information.", "references": ["https://www.incibe.es/en/incibe-cert/notices/aviso/cross-site-scripting-vulnerability-cksource-ckeditor", "https://nvd.nist.gov/vuln/detail/CVE-2023-4771"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}, {"id": "CVE-2023-28439", "noindex": false, "published": "2023-03-22T20:55:00.208Z", "modified": "2025-02-13T16:48:42.069Z", "cvss": 4.7, "cvss_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N", "severity": "medium", "epss": 0.00725, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2023-28439", "title": "ckeditor4 plugins vulnerable to cross-site scripting caused by the editor instance destroying process", "description": "CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A cross-site scripting vulnerability has been discovered affecting Iframe Dialog and Media Embed packages. The vulnerability may trigger a JavaScript code after fulfilling special conditions: using one of the affected packages on a web page with missing proper Content Security Policy configuration; initializing the editor on an element and using an element other than `<textarea>` as a base; and destroying the editor instance. This vulnerability might affect a small percentage of integrators that depend on dynamic editor initialization/destroy mechanism.\n\nA fix is available ", "references": ["https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-vh5c-xwqv-cv9g", "https://ckeditor.com/cke4/addon/embed", "https://ckeditor.com/cke4/addon/iframe"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}, {"id": "CVE-2023-22457", "noindex": false, "published": "2023-01-04T14:24:39.871Z", "modified": "2025-03-10T21:33:09.143Z", "cvss": 9.1, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H", "severity": "critical", "epss": 0.19284, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2023-22457", "title": "org.xwiki.contrib:application-ckeditor-ui vulnerable to Remote Code Execution via Cross-Site Request Forgery", "description": "CKEditor Integration UI adds support for editing wiki pages using CKEditor. Prior to versions 1.64.3,t he `CKEditor.HTMLConverter` document lacked a protection against Cross-Site Request Forgery (CSRF), allowing to execute macros with the rights of the current user. If a privileged user with programming rights was tricked into executing a GET request to this document with certain parameters (e.g., via an image with a corresponding URL embedded in a comment or via a redirect), this would allow arbitrary remote code execution and the attacker could gain rights, access private information or impact the availability of the wiki. The issue has bee", "references": ["https://github.com/xwiki-contrib/application-ckeditor/security/advisories/GHSA-6mjp-2rm6-9g85", "https://github.com/xwiki-contrib/application-ckeditor/commit/6b1053164386aefc526df7512bc664918aa6849b", "https://jira.xwiki.org/browse/CKEDITOR-475"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}, {"id": "CVE-2022-31175", "noindex": false, "published": "2022-08-03T19:05:13.000Z", "modified": "2025-04-23T17:54:13.307Z", "cvss": 5.8, "cvss_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L", "severity": "medium", "epss": 0.00883, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2022-31175", "title": "Cross-site scripting caused by the editor instance destroying process in ckeditor5", "description": "CKEditor 5 is a JavaScript rich text editor. A cross-site scripting vulnerability has been discovered affecting three optional CKEditor 5's packages in versions prior to 35.0.1. The vulnerability allowed to trigger a JavaScript code after fulfilling special conditions. The affected packages are `@ckeditor/ckeditor5-markdown-gfm`, `@ckeditor/ckeditor5-html-support`, and `@ckeditor/ckeditor5-html-embed`. The specific conditions are 1) Using one of the affected packages. In case of `ckeditor5-html-support` and `ckeditor5-html-embed`, additionally, it was required to use a configuration that allows unsafe markup inside the editor. 2) Destroying t", "references": ["https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-42wq-rch8-6f6j", "https://ckeditor.com/docs/ckeditor5/latest/features/general-html-support.html", "https://ckeditor.com/docs/ckeditor5/latest/features/html-embed.html"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}, {"id": "CVE-2022-24729", "noindex": false, "published": "2022-03-16T00:00:00.000Z", "modified": "2025-04-23T18:53:35.902Z", "cvss": 6.5, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "severity": "medium", "epss": 0.02487, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2022-24729", "title": "Regular expression Denial of Service in dialog plugin", "description": "CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. CKEditor4 prior to version 4.18.0 contains a vulnerability in the `dialog` plugin. The vulnerability allows abuse of a dialog input validator regular expression, which can cause a significant performance drop resulting in a browser tab freeze. A patch is available in version 4.18.0. There are currently no known workarounds.", "references": ["https://ckeditor.com/cke4/release/CKEditor-4.18.0", "https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-f6rf-9m92-x2hh", "https://www.oracle.com/security-alerts/cpujul2022.html"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}, {"id": "CVE-2022-24728", "noindex": false, "published": "2022-03-16T00:00:00.000Z", "modified": "2025-04-23T18:53:42.950Z", "cvss": 5.4, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "severity": "medium", "epss": 0.01203, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2022-24728", "title": "Cross-site Scripting in CKEditor4", "description": "CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A vulnerability has been discovered in the core HTML processing module and may affect all plugins used by CKEditor 4 prior to version 4.18.0. The vulnerability allows someone to inject malformed HTML bypassing content sanitization, which could result in executing JavaScript code. This problem has been patched in version 4.18.0. There are currently no known workarounds.", "references": ["https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-4fc4-4p5g-6w89", "https://github.com/ckeditor/ckeditor4/commit/d158413449692d920a778503502dcb22881bc949", "https://ckeditor.com/cke4/release/CKEditor-4.18.0"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}, {"id": "CVE-2021-41165", "noindex": false, "published": "2021-11-17T19:15:11.000Z", "modified": "2024-08-04T02:59:31.758Z", "cvss": 8.2, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L", "severity": "high", "epss": 0.01573, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2021-41165", "title": "HTML comments vulnerability allowing to execute JavaScript code", "description": "CKEditor4 is an open source WYSIWYG HTML editor. In affected version a vulnerability has been discovered in the core HTML processing module and may affect all plugins used by CKEditor 4. The vulnerability allowed to inject malformed comments HTML bypassing content sanitization, which could result in executing JavaScript code. It affects all users using the CKEditor 4 at version < 4.17.0. The problem has been recognized and patched. The fix will be available in version 4.17.0.", "references": ["https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-417", "https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-7h26-63m7-qhf2", "https://www.oracle.com/security-alerts/cpujan2022.html"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}, {"id": "CVE-2021-41164", "noindex": false, "published": "2021-11-17T00:00:00.000Z", "modified": "2024-08-04T02:59:31.641Z", "cvss": 8.2, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L", "severity": "high", "epss": 0.01346, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2021-41164", "title": "Advanced Content Filter (ACF) vulnerability allowing to execute JavaScript code using malformed HTML", "description": "CKEditor4 is an open source WYSIWYG HTML editor. In affected versions a vulnerability has been discovered in the Advanced Content Filter (ACF) module and may affect all plugins used by CKEditor 4. The vulnerability allowed to inject malformed HTML bypassing content sanitization, which could result in executing JavaScript code. It affects all users using the CKEditor 4 at version < 4.17.0. The problem has been recognized and patched. The fix will be available in version 4.17.0.", "references": ["https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-pvmx-g8h5-cprj", "https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-417", "https://www.oracle.com/security-alerts/cpujan2022.html"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}, {"id": "CVE-2021-37695", "noindex": false, "published": "2021-08-12T23:10:10.000Z", "modified": "2024-08-04T01:23:01.506Z", "cvss": 7.3, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N", "severity": "high", "epss": 0.01318, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2021-37695", "title": "Execution of JavaScript code using malformed HTML in ckeditor", "description": "ckeditor is an open source WYSIWYG HTML editor with rich content support. A potential vulnerability has been discovered in CKEditor 4 [Fake Objects](https://ckeditor.com/cke4/addon/fakeobjects) package. The vulnerability allowed to inject malformed Fake Objects HTML, which could result in executing JavaScript code. It affects all users using the CKEditor 4 plugins listed above at version < 4.16.2. The problem has been recognized and patched. The fix will be available in version 4.16.2.", "references": ["https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-m94c-37g6-cjhc", "https://github.com/ckeditor/ckeditor4/commit/de3c001540715f9c3801aaa38a1917de46cfcf58", "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYA354LJP47KCVJMTUO77ZCX3ZK42G3T/"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}, {"id": "CVE-2021-21391", "noindex": false, "published": "2021-04-29T00:20:19.000Z", "modified": "2024-08-03T18:09:15.938Z", "cvss": 6.5, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "severity": "medium", "epss": 0.01667, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2021-21391", "title": "Regular expression Denial of Service in multiple packages", "description": "CKEditor 5 provides a WYSIWYG editing solution. This CVE affects the following npm packages: ckeditor5-engine, ckeditor5-font, ckeditor5-image, ckeditor5-list, ckeditor5-markdown-gfm, ckeditor5-media-embed, ckeditor5-paste-from-office, and ckeditor5-widget. Following an internal audit, a regular expression denial of service (ReDoS) vulnerability has been discovered in multiple CKEditor 5 packages. The vulnerability allowed to abuse particular regular expressions, which could cause a significant performance drop resulting in a browser tab freeze. It affects all users using the CKEditor 5 packages listed above at version <= 26.0.0. The problem ", "references": ["https://www.npmjs.com/package/%40ckeditor/ckeditor5-markdown-gfm", "https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-3rh3-wfr4-76mj", "https://www.npmjs.com/package/%40ckeditor/ckeditor5-engine"], "fixes": [], "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}]}], "total": 17, "unknown_count": 0, "release_unconfirmed": false, "page": 1, "pages": 1, "filtered": false, "noindex": false, "filters": {}, "page_size": 20, "products": [{"name": "ckeditor3", "path": "vulns/ubuntu-18.04-lts/ckeditor3", "ecosystem": "Ubuntu:18.04:LTS"}], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}, {"name": "web", "path": "vulns/stack/web", "slug": "web"}, {"name": "php", "path": "vulns/stack/php", "slug": "php"}, {"name": "python", "path": "vulns/stack/python", "slug": "python"}, {"name": "node", "path": "vulns/stack/node", "slug": "node"}, {"name": "database", "path": "vulns/stack/database", "slug": "database"}, {"name": "containers", "path": "vulns/stack/containers", "slug": "containers"}, {"name": "network", "path": "vulns/stack/network", "slug": "network"}, {"name": "applications", "path": "vulns/stack/applications", "slug": "applications"}], "versions": [], "stats": {"recent": 0, "kev": 0}, "lastmod": "2026-03-19T18:45:43.135Z", "early_advisories": [], "license": "You may freely use the PatchFirst selection and our additions (priorities, early warnings, texts, summaries and aggregates) for your own purposes, including internal business use. Resale, commercial distribution and bulk mirroring of this selection or these additions require a written agreement with the operator. Whenever you use or publish the selection or our additions, credit PatchFirst (https://patchfirst.dev/vulns/) with this link to the regional feed page. Original records from open sources remain subject to their respective licenses and terms. These conditions do not restrict your rights to the original data, which you can obtain directly from those sources.", "terms_url": "https://patchfirst.dev/vulns/#feed-terms", "attribution": {"name": "PatchFirst", "url": "https://patchfirst.dev/vulns/"}, "source_changes": "Records are selected, normalized and combined by PatchFirst; summaries and translations may be added. News is credited with a link to the original source in each entry.", "sources": [{"id": "cve", "name": "CVE List / CVE.org", "url": "https://www.cve.org/", "license": "CVE Terms of Use", "terms_url": "https://www.cve.org/Legal/TermsOfUse", "notice": "Copyright © 1999–2021, The MITRE Corporation. LICENSE Submissions : For all materials you submit to the Common Vulnerabilities and Exposures (CVE™), you hereby grant to The MITRE Corporation (MITRE) and all CVE Numbering Authorities (CNAs) a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute such materials and derivative works. Unless required by applicable law or agreed to in writing, you provide such materials on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including, without limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. CVE Usage : MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy. 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IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR\n ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\n (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON\n ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS\n SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."}, {"id": "nuclei", "name": "Nuclei Templates", "url": "https://github.com/projectdiscovery/nuclei-templates", "license": "MIT", "terms_url": "https://github.com/projectdiscovery/nuclei-templates/blob/main/LICENSE.md", "notice": "MIT License\n\nCopyright (c) 2025 ProjectDiscovery, Inc.\n\nPermission is hereby granted, free of charge, to any person obtaining a copy\nof this software and associated documentation files (the \"Software\"), to deal\nin the Software without restriction, including without limitation the rights\nto use, copy, modify, merge, publish, distribute, sublicense, and/or sell\ncopies of the Software, and to permit persons to whom the Software is\nfurnished to do so, subject to the following conditions:\n\nThe above copyright notice and this permission notice shall be included in all\ncopies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\nIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\nFITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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