CVE-2025-61676

October CMS Vulnerable to Stored XSS via Branding Styles

State: Published
Severity: 6.1 Medium
Published: Jan 10, 2026
Updated: Jan 12, 2026
Reserved: Sep 29, 2025

Description

October is a Content Management System (CMS) and web platform. Prior to versions 3.7.13 and 4.0.12, a cross-site scripting (XSS) vulnerabilities was identified in October CMS backend configuration forms. A user with the Customize Backend Styles permission could inject malicious HTML/JS into the stylesheet input at Styles from Branding & Appearance settings. A specially crafted input could break out of the intended <style> context, allowing arbitrary script execution across backend pages for all users. This issue has been patched in versions 3.7.13 and 4.0.12.

Scores

CVSS	Score	Vector	Source
3.1	6.1 Medium	CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
octoberoctobercms	>= 4.0.0, < 4.0.12Affected < 3.7.13Affected

References

https://github.com/octobercms/october/security/advisories/GHSA-wvpq-h33f-8rp6

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