October CMS has Stored XSS via SVG Filter Bypass
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
October is a Content Management System (CMS) and web platform. Versions prior to 3.7.14 and 4.1.10 contain a stored cross-site scripting (XSS) vulnerability in the SVG sanitization logic. The regex pattern used to strip event handler attributes (such as onclick or onload) could be bypassed using a crafted payload that exploits how the pattern matches attribute boundaries, allowing malicious SVG files to be uploaded through the Media Manager with embedded JavaScript. Exploitation could lead to privilege escalation if a superuser views or embeds the malicious SVG, and requires authenticated backend access with media upload permissions. The SVG must be viewed or embedded in a page for the payload to trigger. This issue has been fixed in versions 3.7.14 and 4.1.10.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
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 | before 3.7.14; 4.0.0 to before 4.1.10 | 3.7.14, 4.1.10 | Patch available | CNA |
| — | october/rain (Packagist) | 4.0.0 to before 4.1.10 | 4.1.10 | Patch available | GHSA-gcqv-f29m-67gr |
| — | october/rain (Packagist) | before 3.7.14 | 3.7.14 | Patch available | GHSA-gcqv-f29m-67gr |
- october VendorOctober CMS Affected before 3.7.14; 4.0.0 to before 4.1.10 Fixed in 3.7.14, 4.1.10 Patch available CNA
- october/rain (Packagist) Vendor— Affected 4.0.0 to before 4.1.10 Fixed in 4.1.10 Patch available GHSA-gcqv-f29m-67gr
- october/rain (Packagist) Vendor— Affected before 3.7.14 Fixed in 3.7.14 Patch available GHSA-gcqv-f29m-67gr
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:* | up to 3.7.13; 4.0.0 – 4.1.9 | Vulnerable | October CMS |
- cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:* Versions up to 3.7.13; 4.0.0 – 4.1.9 Vulnerable ·October CMS
Remediation
- Fix · CNA october (octobercms) Fixed in 3.7.14, 4.1.10
- Fix · GHSA-gcqv-f29m-67gr october/rain (Packagist) Fixed in 4.1.10 Advisory →
- Fix · GHSA-gcqv-f29m-67gr october/rain (Packagist) Fixed in 3.7.14 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-25133
- 2026-10-03 Alias added: GHSA-gcqv-f29m-67gr
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-2026-25133 · CVE Program
- CVE-2026-25133 · NVD
- FIRST EPSS
- GHSA-gcqv-f29m-67gr · 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