CVE-2026-111639

bbs-go through 4.4.6 contains an authentication bypass vulnerability in the /api/login/google one tap endpoint that allows remote attackers to log in as other users by submitting Google ID tokens issued to any OAuth client. Attackers operating their own Google OAuth client can capture a victim's Google-signed ID token and replay it, since the aud claim is never checked, to obtain an authenticated session as the victim's Google-linked account.