Vulnerability Description
HtmlSanitizer before 9.2.1039 and 10.0 prereleases before 10.0.1037-beta contains a cross-site scripting vulnerability because SanitizeDom(string) never sanitizes attributes on the html and body wrapper elements. Attackers can supply input with a second body or html tag carrying event handlers like onload, executing script when applications render serialized document or body outer HTML.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/mganss/HtmlSanitizer
- https://github.com/mganss/HtmlSanitizer/blob/v9.2.995/src/HtmlSanitizer/HtmlSani
- https://github.com/mganss/HtmlSanitizer/blob/v9.2.995/src/HtmlSanitizer/HtmlSani
- https://github.com/mganss/HtmlSanitizer/commit/96afbc818e64de7571ea17954a05d523e
- https://github.com/mganss/HtmlSanitizer/commit/ab626e7a4f2893f7e9ec0a72779ae19c5
- https://github.com/mganss/HtmlSanitizer/releases/tag/v10.0.1037-beta
- https://github.com/mganss/HtmlSanitizer/releases/tag/v9.2.1039
- https://joshua.hu/htmlsanitizer-sanitizedom-body-html-attribute-bypass
- https://www.vulncheck.com/advisories/htmlsanitizer-before-9.2.1039-xss-via-sanit
FAQ
What is CVE-2026-116538?
CVE-2026-116538 is a vulnerability with a CVSS score of 4.7 (MEDIUM). HtmlSanitizer before 9.2.1039 and 10.0 prereleases before 10.0.1037-beta contains a cross-site scripting vulnerability because SanitizeDom(string) never sanitizes attributes on the html and body wrapp...
How severe is CVE-2026-116538?
CVE-2026-116538 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-116538?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.