CRITICAL

CVE-2026-73278

Gitea WebAuthn bypass during OAuth and OIDC sign-in

CVSS v3

9.8

CRITICAL

EPSS Score

—

exploit probability

CISA KEV

known exploited

Exploitation

—

SSVC status

Description

Gitea's OAuth2 and OpenID Connect sign-in paths do not require a WebAuthn challenge when WebAuthn is the account's only configured second factor. A party able to authenticate through the affected external identity flow can obtain a full session without the passkey verification enforced during password login. One affected path can also persist an external identity link, extending the compromise beyond the initial session; accounts with TOTP configured are outside the reported WebAuthn-only scenar

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2026-10-06
Last Modified: 2026-10-07

Frequently asked questions

What is CVE-2026-73278?

Is CVE-2026-73278 actively exploited?

Active exploitation of CVE-2026-73278 has not been confirmed.

What is the CVSS score for CVE-2026-73278?

CVE-2026-73278 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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