High severity8.1NVD Advisory· Published Oct 16, 2026· Updated Oct 16, 2026
CVE-2026-111639
CVE-2026-111639
Description
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.
Affected products
1Patches
Vulnerability mechanics
References
4- github.com/mlogclub/bbs-go/blob/v4.4.6/internal/pkg/google/jwt.gonvd
- github.com/mlogclub/bbs-go/blob/v4.4.6/internal/services/third_user_service.gonvd
- hackmd.io/@hieuPenguinnn/bbs-go-google-one-tap-id-token-audience-confusion-account-takeovernvd
- www.vulncheck.com/advisories/bbs-go-through-4.4.6-account-takeover-via-google-one-tap-loginnvd
News mentions
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