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Critical Authentication Bypass in Gitea CVE-2026-20896
CVE-2026-20896 is a critical authentication bypass vulnerability affecting Gitea official Docker images, carrying a CVSS score of 9.8. The flaw arises from a misconfiguration where the application trusts the 'X-WEBAUTH-USER' HTTP header regardless of the source IP address. This allows unauthenticated remote attackers to spoof user identities and gain elevated or administrative privileges via HTTP header injection. Threat actors are currently actively scanning and exploiting vulnerable instances to target the window between patch release and administrator implementation. Successful exploitation places private source code repositories, sensitive environment secrets, and user configuration data at immediate risk of compromise.
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