What’s Vulnerable › Vulnerabilities

CVE-2026-111636: OpenBMB StaffDeck through 0.5.6 Authentication Bypass via Hard-Coded Session Secret

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-16 · updated 2026-10-16
• Weakness: CWE-321

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.

Affected products

• OpenBMB StaffDeck: through 0.5.6

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

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