Cross-site scripting in SilverStripe Framework - CVE-2026-88988
Published: November 6, 2026
Vulnerability identifier: #VU159832
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-88988
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an authenticated CMS author to execute JavaScript in the browser of another user who views attacker-controlled stored content.
The vulnerability exists due to the SilverStripe Framework HTML sanitiser failing to remove SVG data URIs from submitted content. An authenticated CMS author can embed a malicious SVG data URI in stored content and trigger script execution when another user views it.
Affected software
SilverStripe Framework
How to mitigate CVE-2026-88988
Install security update from vendor's website.
SilverStripe Framework - update to 6.2.13