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Medium severity4.8NVD Advisory· Published Apr 14, 2026· Updated Apr 23, 2026

CVE-2026-25133

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.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
october/rainPackagist
>= 4.0.0, < 4.1.104.1.10
october/rainPackagist
< 3.7.143.7.14

Affected products

1

Patches

0

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

3

News mentions

50