CVE-2026-66010

DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOMELEMENTHANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into...

EUVD-2026-48582

DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOMELEMENTHANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into...

Cloudflare Public Bug Bounty: Second-Order XSS via javascript protocol in MCP Server Portal Apps leads to ATO

The vulnerability in the MCP Server Portal Apps was caused by missing sanitization of the redirecturi parameter, leading to a second-order XSS vulnerability. An attacker could craft a malicious redirecturi containing JavaScript code, obtain a clientid for this URI, and reuse it when a victim had ...