CVE-2026-111636

Description

OpenBMB StaffDeck through 0.5.6 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge administrator session tokens using the hard-coded default app_secret. Attackers can sign an HMAC-SHA256 token for the seeded 'admin' user in 'tenant_demo' to gain full tenant administration, including stored model and channel credentials.

References

• https://github.com/OpenBMB/StaffDeck/blob/v0.5.6/backend/app/config.py#L10
• https://github.com/OpenBMB/StaffDeck/blob/v0.5.6/backend/app/security/auth.py#L96-L98
• https://hackmd.io/@hieuPenguinnn/staffdeck-default-token-signing-secret-auth-bypass
• https://www.vulncheck.com/advisories/openbmb-staffdeck-through-0.5.6-authentication-bypass-via-hard-coded-session-secret