CVE-2026-24906: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in octobercms october
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
AI Analysis
Technical Summary
This vulnerability (CVE-2026-24906) affects OctoberCMS's Backend Editor Settings in versions prior to 3.7.14 and 4.1.10. The Markup Classes fields used for styling do not properly sanitize input, allowing stored XSS attacks via unsanitized JavaScript in the Froala editor dropdown menus. When a user with access to the RichEditor opens it, the malicious script executes. This requires authenticated backend access with editor settings permissions and can lead to privilege escalation if a superuser is tricked into opening the editor. The vulnerability has been addressed in the specified patched versions.
Potential Impact
Successful exploitation allows an attacker with editor settings permissions to execute arbitrary JavaScript in the context of the backend interface. This can lead to privilege escalation if a superuser opens the RichEditor, potentially compromising the CMS backend. The impact is limited to authenticated users with specific permissions and does not affect unauthenticated users.
Mitigation Recommendations
A fix is available in OctoberCMS versions 3.7.14 and 4.1.10. Users should upgrade to these or later versions to remediate the vulnerability. Until upgrading, restrict editor settings permissions strictly to fully trusted administrators to reduce risk.
CVE-2026-24906: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in octobercms october
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
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-24906) affects OctoberCMS's Backend Editor Settings in versions prior to 3.7.14 and 4.1.10. The Markup Classes fields used for styling do not properly sanitize input, allowing stored XSS attacks via unsanitized JavaScript in the Froala editor dropdown menus. When a user with access to the RichEditor opens it, the malicious script executes. This requires authenticated backend access with editor settings permissions and can lead to privilege escalation if a superuser is tricked into opening the editor. The vulnerability has been addressed in the specified patched versions.
Potential Impact
Successful exploitation allows an attacker with editor settings permissions to execute arbitrary JavaScript in the context of the backend interface. This can lead to privilege escalation if a superuser opens the RichEditor, potentially compromising the CMS backend. The impact is limited to authenticated users with specific permissions and does not affect unauthenticated users.
Mitigation Recommendations
A fix is available in OctoberCMS versions 3.7.14 and 4.1.10. Users should upgrade to these or later versions to remediate the vulnerability. Until upgrading, restrict editor settings permissions strictly to fully trusted administrators to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-01-27T19:35:20.530Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69df733482d89c981ff25cd7
Added to database: 4/15/2026, 11:15:00 AM
Last enriched: 4/15/2026, 11:15:30 AM
Last updated: 4/20/2026, 5:04:17 PM
Views: 32
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