CVE-2026-25946: Gitea OpenID discovery server-side request forgery

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-14 · updated 2026-10-14
Weakness: CWE-918

Description

When OpenID sign-in is enabled, Gitea accepts a user-supplied OpenID URL and performs discovery requests without validating the destination against internal network addresses. An unauthenticated remote attacker can cause the server to contact loopback or private-network HTTP services. This can expose internal service behavior and enable interaction with resources that are not directly reachable by the attacker.

Affected products

Gitea Open Source Git Server: 1.25.4

References

https://github.com/go-gitea/gitea/pull/36729
https://github.com/go-gitea/gitea/security/advisories/GHSA-9574-292w-9wmw

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