What’s Vulnerable › Vulnerabilities

CVE-2026-20896: Gitea Docker image trusts spoofable reverse-proxy headers by default

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-03 · updated 2026-10-25
• Weakness: CWE-284

Description

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.

Affected products

• Gitea Open Source Git Server: through 1.26.2

References

• https://blog.gitea.com/release-of-1.26.3-and-1.26.4/
• https://github.com/go-gitea/gitea/pull/38151
• https://github.com/go-gitea/gitea/releases/tag/v1.26.3
• https://github.com/go-gitea/gitea/security/advisories/GHSA-f75j-4cw6-rmx4
• https://github.com/go-gitea/gitea/security/advisories/GHSA-f75j-4cw6-rmx4

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