What is CVE-2025-61676?

CVE-2025-61676 is a medium-severity vulnerability in Octobercms October, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-01-10.

How severe is CVE-2025-61676?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Octobercms October

CVE-2025-61676

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (8.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N.

Affected products

Octobercms October — versions >= 4.0.0, < 4.0.12, < 3.7.13

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-61676?: CVE-2025-61676 is a medium-severity vulnerability in Octobercms October, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-01-10.
How severe is CVE-2025-61676?: Medium severity. CVSS v3 base score is 6.1 out of 10.