What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-23 · updated 2026-10-24
• Weakness: CWE-79

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 products

• cure53 DOMPurify: before 3.4.11 — fixed in 3.4.11

How to fix

Upgrade to a fixed version: cure53 DOMPurify 3.4.11. Check the vendor advisory for mitigations.

References

• https://github.com/cure53/DOMPurify/security/advisories/GHSA-cmwh-pvxp-8882
• https://www.vulncheck.com/advisories/dompurify-before-permanent-attribute-allowlist-pollution-via-setconfig
• https://github.com/cure53/DOMPurify/security/advisories/GHSA-cmwh-pvxp-8882

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