CVE-2026-65902

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A hook that mutates these fields permanently widens the default allow-lists for the lifetime of the DOMPurify instance, so all subsequent default-config sanitize calls inherit the widened defaults and attacker payloads using the poisoned tag/attribute name survive sanitization. removeAllHooks(), clearConfig(), and passing a fresh cfg do not recover the state; only constructing a new DOMPurify instance does."}, {"lang": "es", "value": "DOMPurify antes de la versi\u00f3n 3.4.7 (versiones afectadas menor o igual que 3.4.5) pasa referencias directas a los conjuntos DEFAULT_ALLOWED_TAGS y DEFAULT_ALLOWED_ATTR a nivel de m\u00f3dulo a los hooks uponSanitizeElement y uponSanitizeAttribute a trav\u00e9s de data.allowedTags / data.allowedAttributes cuando se llama a sanitize sin un array expl\u00edcito cfg.ALLOWED_TAGS / cfg.ALLOWED_ATTR. Un hook que muta estos campos ampl\u00eda permanentemente las listas de permitidos predeterminadas durante la vida \u00fatil de la instancia de DOMPurify, por lo que todas las llamadas posteriores a sanitize con configuraci\u00f3n predeterminada heredan los valores predeterminados ampliados y las cargas \u00fatiles del atacante que utilizan el nombre de etiqueta/atributo envenenado sobreviven a la sanitizaci\u00f3n. removeAllHooks(), clearConfig() y pasar una nueva cfg no recuperan el estado; solo la construcci\u00f3n de una nueva instancia de DOMPurify lo hace."}], "id": "CVE-2026-65902", "lastModified": "2026-10-29T21:17:29.723", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-65902", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-23T13:58:18.807154Z", "version": "2.0.3"}}]}, "published": "2026-07-23T14:18:05.453", "references": [{"source": "disclosure@vulncheck.com", "tags": ["Patch"], "url": "https://github.com/cure53/DOMPurify/commit/7996f1dc78eb8b7922388aed75d94a9f8fad9a36"}, {"source": "disclosure@vulncheck.com", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-76mc-f452-cxcm"}, {"source": "disclosure@vulncheck.com", "tags": ["Third Party Advisory"], "url": "https://www.vulncheck.com/advisories/dompurify-before-hook-mutation-pollution-via-allowedtags"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-76mc-f452-cxcm"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-501"}], "source": "disclosure@vulncheck.com", "type": "Secondary"}]}

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