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thunderbird vulnerabilities · Page 31

Vulnerabilities published for thunderbird in the last 30 days: 216. Listed in the KEV catalogue: 0.

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Vulnerabilities: 1318

  1. CVE-2025-6425

    Medium · CVSS 4.3EPSS 0.31%Fix available

    The WebCompat WebExtension shipped with Firefox exposed a persistent UUID

    An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

    • Update to 1:128.12.0esr-1~deb12u1
    Published Updated
  2. CVE-2025-5986

    Medium · CVSS 6.5EPSS 0.58%Fix available

    Unsolicited File Download, Disk Space Exhaustion, and Credential Leakage via mailbox:/// Links

    A crafted HTML email using mailbox:/// links can trigger automatic, unsolicited downloads of .pdf files to the user's desktop or home directory without prompting, even if auto-saving is disabled. This behavior can be abused to fill the disk with garbage data (e.g. using /dev/urandom on Linux) or to leak Windows credentials via SMB links when the email is viewed in HTML mode. While user interaction is required to download the .pdf file, visual obfuscation can conceal the download trigger. Viewing the email in HTML mode is enough to load external content. This vulnerability was fixed in Thunderbird 128.11.1 and Thunderbird 139.0.2.

    • Update to 1:128.12.0esr-1~deb12u1
    Published Updated
  3. CVE-2025-5269

    High · CVSS 8.1EPSS 0.48%Fix available

    Memory safety bug fixed in Firefox ESR 128.11 and Thunderbird 128.11

    Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox ESR 128.11 and Thunderbird 128.11.

    • Update to 1:128.11.0esr-1~deb12u1
    Published Updated
  4. CVE-2025-5268

    High · CVSS 8.1EPSS 0.51%Fix available

    Memory safety bugs fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and Thunderbird 128.11

    Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.

    • Update to 1:128.11.0esr-1~deb12u1
    Published Updated
  5. CVE-2025-5267

    Medium · CVSS 5.4EPSS 0.28%Fix available

    Clickjacking vulnerability could have led to leaking saved payment card details

    A clickjacking vulnerability could have been used to trick a user into leaking saved payment card details to a malicious page. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.

    • Update to 1:128.11.0esr-1~deb12u1
    Published Updated
  6. CVE-2025-5266

    Medium · CVSS 4.3EPSS 0.34%Fix available

    Script element events leaked cross-origin resource status

    Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.

    • Update to 1:128.11.0esr-1~deb12u1
    Published Updated
  7. CVE-2025-5264

    Medium · CVSS 4.8EPSS 0.3%Fix available

    Potential local code execution in “Copy as cURL” command

    Due to insufficient escaping of the newline character in the “Copy as cURL” feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system. This vulnerability was fixed in Firefox 139, Firefox ESR 115.24, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.

    • Update to 1:128.11.0esr-1~deb12u1
    Published Updated
  8. CVE-2025-5263

    Medium · CVSS 4.3EPSS 0.27%Fix available

    Error handling for script execution was incorrectly isolated from web content

    Error handling for script execution was incorrectly isolated from web content, which could have allowed cross-origin leak attacks. This vulnerability was fixed in Firefox 139, Firefox ESR 115.24, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.

    • Update to 1:128.11.0esr-1~deb12u1
    Published Updated
  9. CVE-2025-4919

    High · CVSS 8.8EPSS 9.12%Fix available

    Out-of-bounds access when optimizing linear sums

    An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array index sizes. This vulnerability was fixed in Firefox 138.0.4, Firefox ESR 128.10.1, Firefox ESR 115.23.1, Thunderbird 128.10.2, and Thunderbird 138.0.2.

    • Update to 1:128.11.0esr-1~deb12u1
    Published Updated
  10. CVE-2025-4918

    Critical · CVSS 9.8EPSS 9.52%Fix available

    Out-of-bounds access when resolving Promise objects

    An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability was fixed in Firefox 138.0.4, Firefox ESR 128.10.1, Firefox ESR 115.23.1, Thunderbird 128.10.2, and Thunderbird 138.0.2.

    • Update to 1:128.11.0esr-1~deb12u1
    Published Updated
  11. CVE-2025-3932

    Medium · CVSS 6.5EPSS 0.39%Fix available

    Tracking Links in Attachments Bypassed Remote Content Blocking

    It was possible to craft an email that showed a tracking link as an attachment. If the user attempted to open the attachment, Thunderbird automatically accessed the link. The configuration to block remote content did not prevent that. Thunderbird has been fixed to no longer allow access to web pages listed in the X-Mozilla-External-Attachment-URL header of an email. This vulnerability was fixed in Thunderbird 128.10.1 and Thunderbird 138.0.1.

    • Update to 1:128.10.1esr-1~deb12u1
    Published Updated
  12. CVE-2025-3909

    High · CVSS 8.1EPSS 0.47%Fix available

    JavaScript Execution via Spoofed PDF Attachment and file:/// Link

    Thunderbird's handling of the X-Mozilla-External-Attachment-URL header can be exploited to execute JavaScript in the file:/// context. By crafting a nested email attachment (message/rfc822) and setting its content type to application/pdf, Thunderbird may incorrectly render it as HTML when opened, allowing the embedded JavaScript to run without requiring a file download. This behavior relies on Thunderbird auto-saving the attachment to /tmp and linking to it via the file:/// protocol, potentially enabling JavaScript execution as part of the HTML. This vulnerability was fixed in Thunderbird 128.10.1 and Thunderbird 138.0.1.

    • Update to 1:128.10.1esr-1~deb12u1
    Published Updated
  13. CVE-2025-3875

    High · CVSS 7.5EPSS 0.4%Fix available

    Sender Spoofing via Malformed From Header in Thunderbird

    Thunderbird parses addresses in a way that can allow sender spoofing in case the server allows an invalid From address to be used. For example, if the From header contains an (invalid) value "Spoofed Name ", Thunderbird treats [email protected] as the actual address. This vulnerability was fixed in Thunderbird 128.10.1 and Thunderbird 138.0.1.

    • Update to 1:128.10.1esr-1~deb12u1
    Published Updated
  14. CVE-2025-4093

    High · CVSS 8.1EPSS 0.49%Fix available

    Memory safety bug fixed in Firefox ESR 128.10 and Thunderbird 128.10

    Memory safety bug present in Firefox ESR 128.9, and Thunderbird 128.9. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox ESR 128.10 and Thunderbird 128.10.

    • Update to 1:128.10.0esr-1~deb12u1
    Published Updated
  15. CVE-2025-4091

    High · CVSS 8.1EPSS 0.51%Fix available

    Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10

    Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Thunderbird 138, and Thunderbird 128.10.

    • Update to 1:128.10.0esr-1~deb12u1
    Published Updated

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