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CVE-2025-61676

October CMS Vulnerable to Stored XSS via Branding Styles

Published: Jan 10, 2026Updated: Jan 20, 2026 Sources: CVE List NVD GHSACWE-79
6.1MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 84.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:RS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

octobercms
oss-projectaka ckeditor5, ckeditor4
octoberOn-premWeb App
Web & CMS Plugins / cms-core
Packagist
package-ecosystem
october/system
OSS Libraries

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/octobercms/october/security/advisories/GHSA-wvpq-h33f-8rp6
github.com
https://nvd.nist.gov/vuln/detail/CVE-2025-61676
nvd.nist.gov
https://github.com/octobercms/october
github.com

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