Vulnerability · Published Jul 23, 2026 · Assigned by VulnCheck

CVE-2026-65898DOMPurify before 3.4.11 Permanent Attribute Allowlist Pollution via setConfig

High 7.2

In plain English

A high-severity cross-site scripting in DOMPurify from cure53. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.2High

Exploit odds (30 days)0.2%top 88.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

DOMPurify before 3.4.11 fails to clone the ALLOWED_ATTR allowlist when setConfig() is used with an uponSanitizeAttribute hook, allowing the hook to permanently mutate the shared allowlist. Attackers can register a hook that conditionally allows dangerous attributes like onerror for trusted elements, then submit untrusted content that inherits the polluted allowlist and executes event handlers as stored XSS.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	node-dompurify	no fix listed	DEBIAN-CVE-2026-65898
Debian:13	node-dompurify	no fix listed	DEBIAN-CVE-2026-65898
Debian:14	node-dompurify	3.4.12+dfsg-1	DEBIAN-CVE-2026-65898
Ubuntu:22.04:LTS	node-dompurify	no fix listed	UBUNTU-CVE-2026-65898
Ubuntu:24.04:LTS	node-dompurify	no fix listed	UBUNTU-CVE-2026-65898
Ubuntu:26.04:LTS	node-dompurify	no fix listed	UBUNTU-CVE-2026-65898
npm	dompurify	3.4.11	GHSA-cmwh-pvxp-8882

Affected products (as reported)

Vendor	Product	Versions
cure53	DOMPurify	0 – before 3.4.11

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

References

GitHub Security Advisory (GHSA-cmwh-pvxp-8882) vendor-advisory
VulnCheck Advisory: DOMPurify before 3.4.11 Permanent Attribute Allowlist Pollution via setConfig third-party-advisory