{"id":"CVE-2026-65902","sourceIdentifier":"disclosure@vulncheck.com","published":"2026-07-23T14:18:05.453","lastModified":"2026-10-24T13:10:00.147","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"DOMPurify before 3.4.7 (affected versions <= 3.4.5) 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 versión 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 módulo a los hooks uponSanitizeElement y uponSanitizeAttribute a través de data.allowedTags / data.allowedAttributes cuando se llama a sanitize sin un array explícito cfg.ALLOWED_TAGS / cfg.ALLOWED_ATTR. Un hook que muta estos campos amplía permanentemente las listas de permitidos predeterminadas durante la vida útil de la instancia de DOMPurify, por lo que todas las llamadas posteriores a sanitize con configuración predeterminada heredan los valores predeterminados ampliados y las cargas útiles del atacante que utilizan el nombre de etiqueta/atributo envenenado sobreviven a la sanitización. removeAllHooks(), clearConfig() y pasar una nueva cfg no recuperan el estado; solo la construcción de una nueva instancia de DOMPurify lo hace."}],"affected":[{"source":"disclosure@vulncheck.com","affectedData":[{"vendor":"cure53","product":"DOMPurify","defaultStatus":"unaffected","packageURL":"pkg:npm/dompurify","versions":[{"version":"0","lessThan":"3.4.7","versionType":"semver","status":"affected"},{"version":"3.4.7","versionType":"semver","status":"unaffected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"disclosure@vulncheck.com","type":"Secondary","cvssData":{"version":"4.0","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","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"cvssMetricV31":[{"source":"disclosure@vulncheck.com","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","baseScore":6.1,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":2.7}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-23T13:58:18.807154Z","id":"CVE-2026-65902","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"disclosure@vulncheck.com","type":"Primary","description":[{"lang":"en","value":"CWE-501"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:cure53:dompurify:*:*:*:*:*:*:*:*","versionEndExcluding":"3.4.7","matchCriteriaId":"B8B46CA2-8534-449B-8178-06632ED40826"}]}]}],"references":[{"url":"https://github.com/cure53/DOMPurify/commit/7996f1dc78eb8b7922388aed75d94a9f8fad9a36","source":"disclosure@vulncheck.com","tags":["Patch"]},{"url":"https://github.com/cure53/DOMPurify/security/advisories/GHSA-76mc-f452-cxcm","source":"disclosure@vulncheck.com","tags":["Exploit","Third Party Advisory"]},{"url":"https://www.vulncheck.com/advisories/dompurify-before-hook-mutation-pollution-via-allowedtags","source":"disclosure@vulncheck.com","tags":["Third Party Advisory"]},{"url":"https://github.com/cure53/DOMPurify/security/advisories/GHSA-76mc-f452-cxcm","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["Exploit","Third Party Advisory"]}]}