CVE-2026-24906 Details
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
A stored cross-site scripting vulnerability has been identified in October CMS versions prior to 3.7.14 and 4.1.10. The issue resides in the Backend Editor Settings, specifically within the Markup Classes fields, which are used for various styling purposes. These fields failed to properly sanitize input, allowing malicious values to be injected and subsequently rendered unsanitized in the Froala editor dropdown menus. This exploitation enabled the execution of JavaScript when a user opened a RichEditor. The vulnerability could lead to privilege escalation if a superuser accessed any RichEditor during normal content editing, such as blog post revisions. Exploitation requires authenticated backend access with editor settings permissions.
Users are advised to upgrade to October CMS versions 3.7.14 or 4.1.10. If an immediate upgrade is not possible, restrict editor settings permissions to trusted administrators only.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 16, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/octobercms/october/security/advisories/GHSA-6qmh-j78v-ffp7 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| octobercms october | <= 3.7.13 >= 4.0.0, <= 4.1.9 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 21, 2026 | Initial Analysis | [email protected] |
| Apr 14, 2026 | New CVE Received | [email protected] |