Cross-site scripting in SVG Sanitizer - #VU159652
Published: November 6, 2026
Vulnerability identifier: #VU159652
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: N/A
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to execute JavaScript in a victim's browser through stored cross-site scripting.
The vulnerability exists due to SVG Sanitizer's byte-based DOCTYPE stripping failing to recognize declarations in UTF-16 input with a byte order mark. An unauthenticated remote attacker can submit a crafted SVG containing DTD entities that preserve a JavaScript link through sanitization, triggering execution when the output is embedded inline in HTML and a victim clicks the link.
Affected software
SVG Sanitizer
Remediation
Install security update from vendor's website.
SVG Sanitizer - update to 1.1.0