CVE-2026-65902

{"id": "CVE-2026-65902", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-65902", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-23T13:58:18.807154Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 2.8}], "cvssMetricV40": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 5.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "PASSIVE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "LOW", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "LOW", "vulnConfidentialityImpact": "LOW", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "disclosure@vulncheck.com", "affectedData": [{"vendor": "cure53", "product": "DOMPurify", "versions": [{"status": "affected", "version": "0", "lessThan": "3.4.7", "versionType": "semver"}, {"status": "unaffected", "version": "3.4.7", "versionType": "semver"}], "packageURL": "pkg:npm/dompurify", "defaultStatus": "unaffected"}]}], "published": "2026-07-23T14:18:05.453", "references": [{"url": "https://github.com/cure53/DOMPurify/commit/7996f1dc78eb8b7922388aed75d94a9f8fad9a36", "tags": ["Patch"], "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-76mc-f452-cxcm", "tags": ["Exploit", "Third Party Advisory"], "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/dompurify-before-hook-mutation-pollution-via-allowedtags", "tags": ["Third Party Advisory"], "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-76mc-f452-cxcm", "tags": ["Exploit", "Third Party Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-501"}]}], "descriptions": [{"lang": "en", "value": "DOMPurify before 3.4.7 passes direct references to the module-level DEFAULT_ALLOWED_TAGS and DEFAULT_ALLOWED_ATTR sets to the uponSanitizeElement and uponSanitizeAttribute hooks via data.allowedTags / data.allowedAttributes when sanitize is called without an explicit cfg.ALLOWED_TAGS / cfg.ALLOWED_ATTR array. 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."}], "lastModified": "2026-10-29T21:17:29.723", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:cure53:dompurify:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B8B46CA2-8534-449B-8178-06632ED40826", "versionEndExcluding": "3.4.7"}], "operator": "OR"}]}], "sourceIdentifier": "disclosure@vulncheck.com"}