Cross-Site Scripting Vulnerability in HtmlSanitizer by mganss
CVE-2026-116538

2.3LOW

Key Information:

Vendor

Mganss

Status
Htmlsanitizer
Vendor
CVE Published:
26 October 2026

What is CVE-2026-116538?

HtmlSanitizer prior to version 9.2.1039 and 10.0 prereleases before 10.0.1037-beta is susceptible to cross-site scripting due to inadequate sanitization of attributes in html and body wrapper elements. This vulnerability allows attackers to inject malicious input, potentially executing scripts when the application renders the serialized document or body outer HTML. This security flaw emphasizes the importance of upgrading to secure versions to mitigate risks.

Affected Version(s)

HtmlSanitizer 0 < 9.2.1039

HtmlSanitizer 10.0.0-beta < 10.0.1037-beta

References

https://github.com/mganss/HtmlSanitizer/commit/96afbc818e...
patch
https://github.com/mganss/HtmlSanitizer/commit/ab626e7a4f...
patch
https://github.com/mganss/HtmlSanitizer/blob/v9.2.995/src...
technical-description

CVSS V4

Score:
2.3
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Joshua Rogers
.