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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact Low

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Htmlsanitizer Project
  • Htmlsanitizer
Mganss
  • Htmlsanitizer

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References
Link Providers
https://github.com/mganss/HtmlSanitizer cve-icon cve-icon
https://github.com/mganss/HtmlSanitizer/blob/v9.2.995/src/HtmlSanitizer/HtmlSanitizer.cs#L456-L465 cve-icon cve-icon
https://github.com/mganss/HtmlSanitizer/blob/v9.2.995/src/HtmlSanitizer/HtmlSanitizer.cs#L555-L583 cve-icon cve-icon
https://github.com/mganss/HtmlSanitizer/commit/96afbc818e64de7571ea17954a05d523e819c56f cve-icon cve-icon
https://github.com/mganss/HtmlSanitizer/commit/ab626e7a4f2893f7e9ec0a72779ae19c5ec439a7 cve-icon cve-icon
https://github.com/mganss/HtmlSanitizer/releases/tag/v10.0.1037-beta cve-icon cve-icon
https://github.com/mganss/HtmlSanitizer/releases/tag/v9.2.1039 cve-icon cve-icon
https://joshua.hu/htmlsanitizer-sanitizedom-body-html-attribute-bypass cve-icon cve-icon
https://www.vulncheck.com/advisories/htmlsanitizer-before-9.2.1039-xss-via-sanitizedom-body-and-html-attributes cve-icon cve-icon
History

Sat, 31 Oct 2026 02:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 26 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Mganss
Mganss htmlsanitizer
Vendors & Products Mganss
Mganss htmlsanitizer

Mon, 26 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
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.
Title HtmlSanitizer before 9.2.1039 XSS via SanitizeDom Body and HTML Attributes
First Time appeared Htmlsanitizer Project
Htmlsanitizer Project htmlsanitizer
Weaknesses CWE-79
CPEs cpe:2.3:a:htmlsanitizer_project:htmlsanitizer:*:*:*:*:*:*:*:*
Vendors & Products Htmlsanitizer Project
Htmlsanitizer Project htmlsanitizer
References
Metrics cvssV3_1

{'score': 4.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N'}

cvssV4_0

{'score': 2.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-10-26T14:59:38.815Z

Updated: 2026-10-31T01:25:48.693Z

Reserved: 2026-10-26T14:30:56.846Z

Link: CVE-2026-116538

cve-icon Vulnrichment

Updated: 2026-10-31T01:25:44.318Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-26T16:17:19.030

Modified: 2026-10-31T02:17:32.557

Link: CVE-2026-116538

cve-icon Redhat

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