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,...