CVE-2026-24906

CVE-2026-24906 · October CMS has Stored XSS in its Backend Editor Markup Classes

This page contains facts from public vulnerability sources. Check the original advisory before updating.

October is a Content Management System (CMS) and web platform. Versions prior to 3.7.14 and 4.1.10 contain a Stored Cross-Site Scripting (XSS) vulnerability in the Backend Editor Settings. The Markup Classes fields (used for paragraph styles, inline styles, table styles, etc.) did not sanitize input to valid CSS class name characters. Malicious values were rendered unsanitized in Froala editor dropdown menus, allowing JavaScript execution when any user opened a RichEditor. Exploitation could lead to privilege escalation if a superuser opens any RichEditor during routine content editing (e.g., editing a blog post), and requires authenticated backend access with editor settings permissions. This issue has been fixed in versions 3.7.14 and 4.1.10. To workaround this issue, restrict editor settings permissions to fully trusted administrators only

CVSS 5.1 · Medium · EPSS 0.3% · Fix available

Published

2026-04-14T17:23:20.461Z

Updated

2026-04-16T13:46:05.447Z

Stack: php

Check your server →