Gitea CVE-2026-20896 X-WEBAUTH-USER Header Injection Admin Takeover

Ibrahim Saud@tektrix

•updated Jun 30, 2026•0•0•2

This rule monitors network traffic for the presence of the 'X-WebAuth-User' HTTP header, which is often used in authentication bypass scenarios. The rule specifically alerts when this header is present, especially if the username injected is 'admin', potentially indicating an attempt to impersonate a user or bypass authentication controls on exposed web services or proxy configurations.