#VU123020 Cross-site scripting in Java HTML Sanitizer - CVE-2025-66021
Published: February 18, 2026
Vulnerability identifier: #VU123020
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-66021
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Java HTML Sanitizer
Java HTML Sanitizer
Software vendor:
OWASP
OWASP
Description
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data if HtmlPolicyBuilder allows noscript and style tags with allowTextIn inside the style tag. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Remediation
Install updates from vendor's website.