CVE-2026-20896
CriticalCVSS 9.8Exploitation Probability (EPSS)
Elevated risk52th percentile - higher than 52% of all known CVEs
Summary
Gitea Docker images up to version 1.26.2 set REVERSE_PROXY_TRUSTED_PROXIES=* by default, allowing any source IP to impersonate a user when reverse-proxy authentication headers like X-WEBAUTH-USER are enabled.
Risk Assessment
An external attacker can send crafted HTTP requests with a fake X-WEBAUTH-USER header, bypassing authentication and gaining access to any user account in the Gitea system.
Recommendation
Immediately update the Gitea Docker image to version 1.26.3 or later, and configure REVERSE_PROXY_TRUSTED_PROXIES to specific trusted proxy IP addresses.
Original NVD description (English source)
Gitea Docker image versions up to and including 1.26.2 use REVERSE_PROXY_TRUSTED_PROXIES=* by default, allowing any source IP to impersonate a user when reverse-proxy authentication headers such as X-WEBAUTH-USER are enabled.