OpenBMB StaffDeck through 0.5.6 Authentication Bypass via Hard-Coded Session Secret

Advisories

OpenBMB StaffDeck through 0.5.6 Authentication Bypass via Hard-Coded Session Secret

Severity: critical
Date: 10/16/2026
Affecting: StaffDeck <= 0.5.6
CVE: CVE-2026-111636
CWE: CWE-321 Use of Hard-coded Cryptographic Key
CVSS: 9.2
CVSS V4 Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References: https://hackmd.io/@hieuPenguinnn/staffdeck-default-token-signing-secret-auth-bypass
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
Credit: hieuPenguinnn
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.

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