CVE-2025-66021 — MEDIUM (6.1)

Vulnerability 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.

CVSS Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Owasp	Java Html Sanitizer	20240325.1

Related Weaknesses (CWE)

CWE-79

References

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

FAQ

What is CVE-2025-66021?

CVE-2025-66021 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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....

How severe is CVE-2025-66021?

CVE-2025-66021 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-66021?

Check the references section above for vendor advisories and patch information. Affected products include: Owasp Java Html Sanitizer.