CVE-2026-27779: Gitea forwarded-proto handling allows public URL spoofing

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-03 · updated 2026-10-25
Weakness: CWE-284

Description

Gitea versions before 1.25.5 accept malformed or injected forwarded-proto values when detecting public URLs, allowing spoofed canonical URL generation.

Affected products

Gitea Open Source Git Server: before 1.25.5 — fixed in 1.25.5

How to fix

Upgrade to a fixed version: Gitea Open Source Git Server 1.25.5. Check the vendor advisory for mitigations.

References

https://blog.gitea.com/release-of-1.25.5/
https://github.com/go-gitea/gitea/pull/36810
https://github.com/go-gitea/gitea/pull/36836
https://github.com/go-gitea/gitea/releases/tag/v1.25.5

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