XSS Vulnerability in OWASP Java HTML Sanitizer
CVE-2025-66021

8.6HIGH

Key Information:

Vendor

Owasp

Status
Java-html-sanitizer
Vendor
CVE Published:
26 November 2025

What is CVE-2025-66021?

The OWASP Java HTML Sanitizer, a customizable HTML processor, is susceptible to Cross-Site Scripting (XSS) attacks when certain HTML policy configurations permit the use of 'noscript' and 'style' tags. Specifically, if the HtmlPolicyBuilder allows unfiltered CSS within styled content, attackers could exploit this vulnerability by injecting malicious payloads that evade sanitization. This presents a significant security risk for web applications that rely on user-generated content. As of the latest available information, no patches have been released to rectify this issue.

Affected Version(s)

java-html-sanitizer = 20240325.1

References

https://github.com/OWASP/java-html-sanitizer/security/adv...
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CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.