CVE-2026-111639
CVE-2026-111639 · bbs-go through 4.4.6 Account Takeover via Google One Tap Login
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 8.6 · High · EPSS 0.4%
- Published
- Updated
Affected products and versions
bbs-go
- Versions
- ≥ 0, ≤ 4.4.6: Affected (custom)
No fix published
Original sources
- https://hackmd.io/@hieuPenguinnn/bbs-go-google-one-tap-id-token-audience-confusion-account-takeover
- https://github.com/mlogclub/bbs-go/blob/v4.4.6/internal/pkg/google/jwt.go#L55-L58
- https://github.com/mlogclub/bbs-go/blob/v4.4.6/internal/services/third_user_service.go#L274-L293
- https://www.vulncheck.com/advisories/bbs-go-through-4.4.6-account-takeover-via-google-one-tap-login
- https://nvd.nist.gov/vuln/detail/CVE-2026-111639