CVE-2025-66021 HIGH

CVE-2025-66021: OWASP Java HTML Sanitizer is vulnerable to XSS via noscript tag and improper style tag sanitization

Vendor Owasp

Product java-html-sanitizer

Weakness CWE-79 · XSS

Published November 26, 2025

Last update November 26, 2025

View on NVD All CVEs

CVSS base score

8.6/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction —

Confidentiality —

Integrity —

CVSS vector

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

What the vulnerability does

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.

Key dates

Disclosure timeline

November 26, 2025 CVE published

November 26, 2025 Record updated