CVE-2026-65898
Last modified
CVE-2026-65898 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. 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.. EPSS estimates a 0.15% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Cure53 | Dompurify | < 3.4.11 |
References
- https://github.com/cure53/DOMPurify/security/advisories/GHSA-cmwh-pvxp-8882Exploit, Third Party Advisory
- https://github.com/cure53/DOMPurify/security/advisories/GHSA-cmwh-pvxp-8882Exploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
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