Improper Authentication in Gitea - CVE-2026-73278
Published: August 15, 2026
Vulnerability details
The vulnerability allows a remote attacker to bypass webauthn-based second-factor authentication and gain a full authenticated session.
The vulnerability exists due to improper authentication in OAuth2 and OpenID Connect sign-in handlers when handling OAuth2 or OpenID Connect sign-in flows for accounts that use WebAuthn as their only configured second factor. A remote attacker can authenticate through an affected OAuth sign-in path to bypass webauthn-based second-factor authentication and gain a full authenticated session.
One affected sign-in path can also persist an external identity link to the victim account, which can extend access beyond a single session. Password-based login continued to enforce the WebAuthn challenge.