CVE-2026-65899 — 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-2026-65899MEDIUM

cure53 DOMPurify — DOMPurify before 3.4.9 Trusted Types Policy State Contamination

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   A   N   N   N    5.1   .0023   14.2     —

AFFECTED
  Product    Versions     Fixed
  DOMPurify  unspecified  3.4.9

TIMELINE
  Jul 23  EXPLOIT PUBLISHED — CVE-2026-65899 (cure53 DOMPurify). Public exploit reference added.
  Jul 23  Reserved by VulnCheck
  Jul 23  Published (CNA: VulnCheck)
  Jul 28  EXPLOIT PUBLISHED — CVE-2026-65899 (cure53 DOMPurify). Public exploit reference added.

CWE-693 · CNA: VulnCheck · CVSS v4.0 · 3 references · NVD status: Analyzed

Description

DOMPurify 3.0.0 before 3.4.9 does not reset the retained Trusted Types policy when clearConfig() is called, so a DOMPurify instance reused across trust boundaries stays bound to a previously supplied TRUSTED_TYPES_POLICY. A later caller that requests RETURN_TRUSTED_TYPE output receives a TrustedHTML object created by the old (potentially unsafe) policy rather than a clean default, which can lead to script execution at a Trusted Types sink. Passing TRUSTED_TYPES_POLICY: null on the later call also does not clear the retained policy.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
July 23, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-65899 (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-2026-65899 (cure53 DOMPurify). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
cure53	DOMPurify	—	—	3.4.9

Weaknesses

CWE-693

References (3)

https://github.com/cure53/DOMPurify/commit/825e617753ac1169306a542d3174a77f717a0cf6 [Patch]
https://github.com/cure53/DOMPurify/security/advisories/GHSA-vxr8-fq34-vvx9 [Exploit, Third Party Advisory]
https://www.vulncheck.com/advisories/dompurify-before-trusted-types-policy-state-contamination [Third Party Advisory]

Authoritative record: CVE-2026-65899 at cve.org

Vendors: cure53

Weaknesses: CWE-693

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-65899 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.