CVE-2025-66021

OWASP Java HTML Sanitizer is vulnerable to XSS via noscript tag and improper style tag sanitization

State: Published
Severity: 8.6 High
Published: Nov 26, 2025
Updated: Nov 26, 2025
Reserved: Nov 21, 2025

Description

OWASP Java HTML Sanitizer is a configureable HTML Sanitizer written in Java, allowing inclusion of HTML authored by third-parties in web applications while protecting against XSS. In version 20240325.1, OWASP java html sanitizer is vulnerable to XSS if HtmlPolicyBuilder allows noscript and style tags with allowTextIn inside the style tag. This could lead to XSS if the payload is crafted in such a way that it does not sanitise the CSS and allows tags which is not mentioned in HTML policy. At time of publication no known patch is available.

Scores

CVSS	Score	Vector	Source
4.0	8.6 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
java-html-sanitizerOWASP	= 20240325.1Affected

References

https://github.com/OWASP/java-html-sanitizer/security/advisories/GHSA-g9gq-3pfx-2gw2

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