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CVE-2026-91110 XSS using control bytes

CVE-2026-91110 XSS using control bytes

Severity:
Medium (?)
Identifier:
CVE-2026-91110
Versions Affected:
silverstripe/framework: < 6.2.13
Versions Fixed:
silverstripe/framework: 6.2.13
Release Date:
2026-10-28

The HTML sanitiser did not remove javascript: URLs preceded by certain control bytes. A CMS author could store content that runs JavaScript in the browser of another user who views it.

Base CVSS: 6.4
Reported by: Jack Wallace from Bastion Security