CVE-2026-25133
Description
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.
How to fix
- october/rain4.1.10, 3.7.14 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| octobercms october | v ≤ 3.7.13, 4.0.0 ≤ v ≤ 4.1.9 | — |
| october/rainPackagist | 4.0.0 ≤ v < 4.1.10, v < 3.7.14 | 4.1.10, 3.7.14 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.