CVE-2026-65902 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-65902MEDIUM

cure53 DOMPurify — DOMPurify before 3.4.7 Hook Mutation Pollution via allowedTags

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   P   L   L   N    5.3   .0021   11.5     —

AFFECTED
  Product    Versions     Fixed
  DOMPurify  unspecified  3.4.7

TIMELINE
  Jul 23  EXPLOIT PUBLISHED — CVE-2026-65902 (cure53 DOMPurify). Public exploit reference added.
  Jul 23  Reserved by VulnCheck
  Jul 23  Published (CNA: VulnCheck)
  Jul 28  EXPLOIT PUBLISHED — CVE-2026-65902 (cure53 DOMPurify). Public exploit reference added.

CWE-501 · CNA: VulnCheck · CVSS v4.0 · 3 references · NVD status: Analyzed

Description

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
July 23, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-65902 (cure53 DOMPurify). Public exploit reference added.
July 23, 2026	Reserved	Reserved by VulnCheck
July 23, 2026	Published	Published (CNA: VulnCheck)
July 28, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-65902 (cure53 DOMPurify). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
cure53	DOMPurify	—	—	3.4.7

Weaknesses

CWE-501

References (3)

https://github.com/cure53/DOMPurify/commit/7996f1dc78eb8b7922388aed75d94a9f8fad9a36 [Patch]
https://github.com/cure53/DOMPurify/security/advisories/GHSA-76mc-f452-cxcm [Exploit, Third Party Advisory]
https://www.vulncheck.com/advisories/dompurify-before-hook-mutation-pollution-via-allowedtags [Third Party Advisory]

Authoritative record: CVE-2026-65902 at cve.org

Vendors: cure53

Weaknesses: CWE-501

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-65902 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.