October CMS Vulnerable to Stored XSS via Branding Styles
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| October CMS | october | 4.0.0 to before 4.0.12; before 3.7.13 | 4.0.12, 3.7.13 | Patch available | CNA |
| — | october/system (Packagist) | before 3.7.13 | 3.7.13 | Patch available | GHSA-wvpq-h33f-8rp6 |
| — | october/system (Packagist) | 4.0.0 to before 4.0.12 | 4.0.12 | Patch available | GHSA-wvpq-h33f-8rp6 |
- october VendorOctober CMS Affected 4.0.0 to before 4.0.12; before 3.7.13 Fixed in 4.0.12, 3.7.13 Patch available CNA
- october/system (Packagist) Vendor— Affected before 3.7.13 Fixed in 3.7.13 Patch available GHSA-wvpq-h33f-8rp6
- october/system (Packagist) Vendor— Affected 4.0.0 to before 4.0.12 Fixed in 4.0.12 Patch available GHSA-wvpq-h33f-8rp6
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:* | before 3.7.13; 4.0.0 to before 4.0.12 | Vulnerable | October CMS |
- cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:* Versions before 3.7.13; 4.0.0 to before 4.0.12 Vulnerable ·October CMS
Remediation
- Fix · CNA october (octobercms) Fixed in 4.0.12, 3.7.13
- Fix · GHSA-wvpq-h33f-8rp6 october/system (Packagist) Fixed in 3.7.13 Advisory →
- Fix · GHSA-wvpq-h33f-8rp6 october/system (Packagist) Fixed in 4.0.12 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-61676
- 2026-10-03 Alias added: GHSA-wvpq-h33f-8rp6
References
More October CMS October vulnerabilities
- TI-2021-12316 Account Takeover in Octobercms KEVCVSS 3.1CRITICAL 9.1
- TI-2021-12318 Arbitrary code execution in october/system CVSS 3.1HIGH 8.8
- TI-2017-14456 October CMS build 412 is vulnerable to PHP code execution in the file upload… CVSS 3.0HIGH 7.2
- TI-2023-23545 A Cross-Site Scripting (XSS) vulnerability in installation of October v.3.4.16 allows an… CVSS 3.1MEDIUM 5.4
- TI-2023-19223 An arbitrary file upload vulnerability in October CMS v3.4.4 allows attackers to execute… CVSS 3.1MEDIUM 5.4
- TI-2024-30847 October 3.6.30 allows an authenticated admin account to upload a PDF file containing… CVSS 3.1MEDIUM 4.7
Sources
- CVE-2025-61676 · CVE Program
- CVE-2025-61676 · NVD
- FIRST EPSS
- GHSA-wvpq-h33f-8rp6 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences