{"id":"CVE-2026-116538","published":"2026-10-26T16:17:19.030","lastModified":"2026-10-26T18:39:42.503","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.","cvssScore":4.7,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","cwes":["CWE-79"],"vendors":[],"products":[],"references":[{"url":"https://github.com/mganss/HtmlSanitizer","tags":[]},{"url":"https://github.com/mganss/HtmlSanitizer/blob/v9.2.995/src/HtmlSanitizer/HtmlSanitizer.cs#L456-L465","tags":[]},{"url":"https://github.com/mganss/HtmlSanitizer/blob/v9.2.995/src/HtmlSanitizer/HtmlSanitizer.cs#L555-L583","tags":[]},{"url":"https://github.com/mganss/HtmlSanitizer/commit/96afbc818e64de7571ea17954a05d523e819c56f","tags":[]},{"url":"https://github.com/mganss/HtmlSanitizer/commit/ab626e7a4f2893f7e9ec0a72779ae19c5ec439a7","tags":[]},{"url":"https://github.com/mganss/HtmlSanitizer/releases/tag/v10.0.1037-beta","tags":[]},{"url":"https://github.com/mganss/HtmlSanitizer/releases/tag/v9.2.1039","tags":[]},{"url":"https://joshua.hu/htmlsanitizer-sanitizedom-body-html-attribute-bypass","tags":[]},{"url":"https://www.vulncheck.com/advisories/htmlsanitizer-before-9.2.1039-xss-via-sanitizedom-body-and-html-attributes","tags":[]}],"exploitRefs":[{"url":"https://github.com/mganss/HtmlSanitizer","tags":[]},{"url":"https://github.com/mganss/HtmlSanitizer/blob/v9.2.995/src/HtmlSanitizer/HtmlSanitizer.cs#L456-L465","tags":[]},{"url":"https://github.com/mganss/HtmlSanitizer/blob/v9.2.995/src/HtmlSanitizer/HtmlSanitizer.cs#L555-L583","tags":[]},{"url":"https://github.com/mganss/HtmlSanitizer/commit/96afbc818e64de7571ea17954a05d523e819c56f","tags":[]},{"url":"https://github.com/mganss/HtmlSanitizer/commit/ab626e7a4f2893f7e9ec0a72779ae19c5ec439a7","tags":[]},{"url":"https://github.com/mganss/HtmlSanitizer/releases/tag/v10.0.1037-beta","tags":[]},{"url":"https://github.com/mganss/HtmlSanitizer/releases/tag/v9.2.1039","tags":[]}],"hasPoc":true,"ai":null}