Vulnerability · Published Jan 10, 2026 · Assigned by GitHub_M

CVE-2025-61676October CMS Vulnerable to Stored XSS via Branding Styles

Medium 6.1

In plain English

A medium-severity cross-site scripting in october from octobercms. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.3%top 80.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	october/system	3.7.13	GHSA-wvpq-h33f-8rp6
Packagist	october/system	4.0.12	GHSA-wvpq-h33f-8rp6

Affected products (as reported)

Vendor	Product	Versions
octobercms	october	>= 4.0.0, < 4.0.12< 3.7.13

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N

References

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