Medium severity · published Jan 10, 2026
CVE-2025-61676
October CMS Vulnerable to Stored XSS via Branding Styles
4.8
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OC
october · octobercms
>= 4.0.0, < 4.0.12; < 3.7.13 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-61676
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-61676
Patch
https://github.com/octobercms/october/security/advisories/GHSA-wvpq-h33f-8rp6
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