CVE-2026-24906
Description
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
How to fix
- october/system4.1.10, 3.7.14 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| octobercms october | v ≤ 3.7.13, 4.0.0 ≤ v ≤ 4.1.9 | — |
| october/systemPackagist | 4.0.0 ≤ v < 4.1.10, v < 3.7.14 | 4.1.10, 3.7.14 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.