CVE-2026-20896

CriticalCVSS 9.8

Published: 03/07/2026(UTC)Translated: 04/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Elevated risk

0.78%

52th percentile — higher than 52% of all known CVEs

Summary

Gitea Docker image versions up to and including 1.26.2 set 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.

Risk Assessment

An external attacker can send a crafted request with a fake X-WEBAUTH-USER header, enabling unauthorized access to other users' accounts and potentially taking control of repositories.

Recommendation

Immediately update the Gitea Docker image to a version newer than 1.26.2 and configure REVERSE_PROXY_TRUSTED_PROXIES to specific trusted reverse 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.