{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-116538", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-10-26T14:30:56.846Z", "datePublished": "2026-10-26T14:59:38.815Z", "dateUpdated": "2026-10-31T01:25:48.693Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-26T14:59:38.815Z" }, "datePublic": "2026-08-26T00:00:00.000Z", "title": "HtmlSanitizer before 9.2.1039 XSS via SanitizeDom Body and HTML Attributes", "descriptions": [ { "lang": "en", "value": "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." } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "description": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "cweId": "CWE-79", "type": "CWE" } ] } ], "affected": [ { "vendor": "mganss", "product": "HtmlSanitizer", "defaultStatus": "unaffected", "versions": [ { "version": "0", "status": "affected", "versionType": "semver", "lessThan": "9.2.1039" }, { "version": "10.0.0-beta", "status": "affected", "versionType": "semver", "lessThan": "10.0.1037-beta" } ], "collectionURL": "https://www.nuget.org/packages/HtmlSanitizer", "packageName": "HtmlSanitizer", "packageURL": "pkg:nuget/HtmlSanitizer", "repo": "https://github.com/mganss/HtmlSanitizer" } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:a:htmlsanitizer_project:htmlsanitizer:*:*:*:*:*:*:*:*", "versionEndExcluding": "9.2.1039" }, { "vulnerable": true, "criteria": "cpe:2.3:a:htmlsanitizer_project:htmlsanitizer:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.0.0-beta", "versionEndExcluding": "10.0.1037-beta" } ] } ] } ], "metrics": [ { "format": "CVSS", "cvssV4_0": { "version": "4.0", "vectorString": "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", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "subAvailabilityImpact": "NONE", "baseScore": 2.3, "baseSeverity": "LOW" } }, { "format": "CVSS", "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE", "baseScore": 4.7, "baseSeverity": "MEDIUM" } } ], "references": [ { "url": "https://github.com/mganss/HtmlSanitizer/commit/96afbc818e64de7571ea17954a05d523e819c56f", "tags": [ "patch" ], "name": "Patch Commit" }, { "url": "https://github.com/mganss/HtmlSanitizer/commit/ab626e7a4f2893f7e9ec0a72779ae19c5ec439a7", "tags": [ "patch" ] }, { "url": "https://github.com/mganss/HtmlSanitizer/blob/v9.2.995/src/HtmlSanitizer/HtmlSanitizer.cs#L456-L465", "tags": [ "technical-description" ] }, { "url": "https://github.com/mganss/HtmlSanitizer/blob/v9.2.995/src/HtmlSanitizer/HtmlSanitizer.cs#L555-L583", "tags": [ "technical-description" ] }, { "url": "https://joshua.hu/htmlsanitizer-sanitizedom-body-html-attribute-bypass", "tags": [ "technical-description" ] }, { "url": "https://github.com/mganss/HtmlSanitizer/releases/tag/v9.2.1039", "tags": [ "release-notes" ], "name": "HtmlSanitizer v9.2.1039 Release Notes" }, { "url": "https://github.com/mganss/HtmlSanitizer/releases/tag/v10.0.1037-beta", "tags": [ "release-notes" ], "name": "HtmlSanitizer v10.0.1037-beta Release Notes" }, { "url": "https://github.com/mganss/HtmlSanitizer", "tags": [ "product" ] }, { "name": "VulnCheck Advisory: HtmlSanitizer before 9.2.1039 XSS via SanitizeDom Body and HTML Attributes", "tags": [ "third-party-advisory" ], "url": "https://www.vulncheck.com/advisories/htmlsanitizer-before-9.2.1039-xss-via-sanitizedom-body-and-html-attributes" } ], "credits": [ { "lang": "en", "value": "Joshua Rogers", "type": "finder" } ], "x_generator": { "engine": "vulncheck-endgame" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-10-31T01:25:39.139097Z", "id": "CVE-2026-116538", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-31T01:25:48.693Z" } } ] } }