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

DOMPurify before 3.4.11 fails to clone the ALLOWEDATTR 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,...

GHSA-CMWH-PVXP-8882 DOMPurify: Permanent `ALLOWED_ATTR` pollution via `setConfig()` bypassing the hook clone-guard (incomplete fix of the 3.4.7 hook-pollution patch)

Summary DOMPurify 3.4.7 shipped a security fix "permanent hook pollution" that makes a registered uponSanitizeAttribute hook's mutation of data.allowedAttributes non-persistent — so allowing an attribute for one element does not leak into later sanitize calls. The fix clones ALLOWEDATTR inside...

Improper Initialization

Overview org.webjars.npm:dompurify is a DOM-only XSS sanitizer for HTML, MathML and SVG. Affected versions of this package are vulnerable to Improper Initialization in the DOMPurify.setConfig API when an uponSanitizeAttribute hook is registered that mutates allowedAttributes. An attacker can caus...

PT-2026-63984

Name of the Vulnerable Software and Affected Versions DOMPurify versions prior to 3.4.11 Description An issue exists where the software fails to clone the ALLOWED ATTR allowlist when setConfig is used with an uponSanitizeAttribute hook. This allows the hook to permanently mutate the shared...