CVE-2026-73804: Auth Bypass

Description

Gitea allows a token with write:user scope to register an attacker-controlled SSH public key on the token owner's account. API requests signed with the corresponding private key authenticate as that account through HTTP Signature without API token scope information, causing route-level token scope checks to be skipped. This converts a user-scoped token into an unscoped API authentication method while retaining the account's normal role and repository permissions.

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Weakness Type (CWE)

CWE-266 CWE-266

CWE-863 Incorrect Authorization

References

Other References

https://blog.gitea.com/release-of-1.27.2/ https://github.com/go-gitea/gitea/pull/38862 https://github.com/go-gitea/gitea/pull/38895 https://github.com/go-gitea/gitea/releases/tag/v1.27.2 https://github.com/go-gitea/gitea/security/advisories/GHSA-q55v-4cmj-xh65

Frequently Asked Questions

What is CVE-2026-73804? +

Gitea allows a token with write:user scope to register an attacker-controlled SSH public key on the token owner's account. API requests signed with the corresponding private key authenticate as that account through HTTP Signature without API token scope information, causing route-level token scope checks to be skipped. This converts a user-scoped token into an unscoped API authentication method while retaining the account's normal role and repository permissions.

How do I check if I'm vulnerable to CVE-2026-73804? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-73804