What’s Vulnerable › Vulnerabilities
CVE-2025-61676: October CMS Vulnerable to Stored XSS via Branding Styles
- Severity: medium (CVSS 4.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-01-10 · updated 2026-06-17
- Weakness: CWE-79
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.
Affected products
- octobercms october: before 3.7.13; from 4.0.0 before 4.0.12 — fixed in 3.7.13, 4.0.12
How to fix
Upgrade to a fixed version: octobercms october 3.7.13, 4.0.12. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2025-61676 or the next vulnerability affects your stack