GHSA-gcqv-f29m-67gr October Rain has Stored XSS via SVG Filter Bypass

• Packagist october/rain: >= 4.0.0, < 4.1.10 → fixed in 4.1.10 • Packagist october/rain: < 3.7.14 → fixed in 3.7.14

A stored cross-site scripting (XSS) vulnerability was identified in the SVG sanitization logic. The regex pattern used to strip `on*` event handler attributes could be bypassed using a crafted payload that exploits how the pattern matches attribute boundaries. Impact • Stored XSS via malicious SVG files uploaded through the Media Manager • Could allow privilege escalation if a superuser views or embeds the malicious SVG • Requires authenticated backend access with media upload permissions (`media.library.create`) • SVG must be viewed or embedded in a page to trigger Patches The vulnerability has been patched in v3.7.14 and v4.1.10. All users are encouraged to upgrade to the latest patched version. Workarounds If upgrading immediately is not possible: • Disable SVG uploads by adding `svg` to the blocked extensions in media configuration • Set `media.clean_vectors` to `true` in configuration (enabled by default) References • Reported by Pentest-Tools.com