{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-65911", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-07-23T12:51:09.595Z", "datePublished": "2026-07-23T13:16:22.748Z", "dateUpdated": "2026-07-23T13:16:22.748Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-07-23T13:16:22.748Z"}, "datePublic": "2026-04-01T00:00:00.000Z", "title": "DOMPurify before 3.4.0 XSS via ADD_ATTR/ADD_TAGS State Leakage", "descriptions": [{"lang": "en", "value": "In DOMPurify through 3.3.3, function predicates supplied via ADD_ATTR or ADD_TAGS to DOMPurify.sanitize() persist in internal state (EXTRA_ELEMENT_HANDLING) across subsequent sanitize() calls on the same instance. If a later call on the same instance provides ADD_ATTR or ADD_TAGS as an array rather than a function, the previously set function handler is neither cleared nor overwritten, so it continues to approve attacker-controlled attributes or tags. This can allow dangerous event-handler attributes or forbidden tags (bypassing FORBID_TAGS) to survive sanitization, resulting in cross-site scripting. The vendor (Cure53) considers this an edge case outside DOMPurify's threat model; the referenced advisory lists 3.4.0 as the patched version."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "cweId": "CWE-79", "type": "CWE"}]}], "affected": [{"vendor": "cure53", "product": "DOMPurify", "defaultStatus": "unaffected", "packageURL": "pkg:npm/dompurify", "versions": [{"version": "0", "status": "affected", "versionType": "semver", "lessThan": "3.4.0"}, {"version": "3.4.0", "status": "unaffected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:cure53:dompurify:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.4.0"}]}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 5.1, "baseSeverity": "MEDIUM", "exploitMaturity": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS"}, {"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "format": "CVSS"}], "references": [{"url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-9p3w-6h5p-cv75", "name": "GitHub Security Advisory (GHSA-9p3w-6h5p-cv75)", "tags": ["vendor-advisory"]}, {"name": "VulnCheck Advisory: DOMPurify before 3.4.0 XSS via ADD_ATTR/ADD_TAGS State Leakage", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/dompurify-before-xss-via-add-attr-add-tags-state-leakage"}], "credits": [{"lang": "en", "value": "offset", "type": "reporter"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.4.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "3.4.0"}}], "enrichment": {"confidence": 100.0, "confidence_source": "inferred", "scores": [{"score": 100.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "DOMPurify", "source": "cna", "vendor": "cure53"}, "product": "dompurify", "vendor": "cure53"}], "created": "2026-07-23T15:15:17.827077+00:00", "updated": "2026-07-23T15:15:17.827107+00:00", "vendors": ["cure53", "cure53$PRODUCT$dompurify"]}