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.
Other vulnerabilities in Gitea
See all- CVE-2026-60004CriticalActively exploited
Gitea before version 1.27.1 allows remote code execution via the diffpatch API through Git hook installation.
- CVE-2026-58508Critical
Two SSRF vulnerabilities in Gitea migration/mirror (DNS rebinding + missing re-validation).
- CVE-2026-58443Critical
Public-only repository tokens can update private PR head branches.
- CVE-2026-58433Critical
The team-repository linking endpoint bypasses the RepoAdminChangeTeamAccess organization setting. This means a user without proper permissions can change repository-team assignments.
- CVE-2026-56750Critical
Theft of the Remember-Me token in Gitea does not invalidate the attacker's session, allowing continued unauthorized access.
- CVE-2026-56654Critical
The vulnerability allows privilege escalation via access token scope escalation in the API.
- CVE-2026-56443Critical
A public-only scope token can bypass restrictions on limited-visibility owners (Repository and Package categories) — residual after CVE-2026-25714 / PR #37118.
- CVE-2026-55982Critical
The OIDC userinfo endpoint returns identity claims without enforcing API token scopes.
- CVE-2026-58426Critical
The vulnerability in Gitea Actions Artifacts V4 stems from HMAC ambiguity in signed URLs, allowing cross-repository artifact read and cross-task upload-state write.
- CVE-2026-27780Critical
A vulnerability in Gitea before version 1.26.0 fails to close the connection on bufio.Scanner errors while processing pre-receive hook input, allowing oversized input to bypass branch-protection checks.
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS