CVE-2026-111636
OpenBMB StaffDeck through 0.5.6 Authentication Bypass via Hard-Coded Session Secret
- State
- Published
- Severity
- 9.2 Critical
- Published
- Oct 16, 2026
- Updated
- Oct 16, 2026
- Reserved
- Oct 16, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.2 Critical | 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 | VulnCheck |
| 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-321 Use of Hard-coded Cryptographic Key
Affected Products
| Product | Versions |
|---|---|
StaffDeckOpenBMB |
|
References
- https://hackmd.io/@hieuPenguinnn/staffdeck-default-token-signing-secret-auth-bypassthird-party-advisory
- https://github.com/OpenBMB/StaffDeck/blob/v0.5.6/backend/app/config.py#L10technical-description
- https://github.com/OpenBMB/StaffDeck/blob/v0.5.6/backend/app/security/auth.py#L96-L98technical-description
- VulnCheck Advisory: OpenBMB StaffDeck through 0.5.6 Authentication Bypass via Hard-Coded Session Secretthird-party-advisory
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.