CVE-2026-111636

critical · 9.2

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.

9.2

CVSS

0.4%

EPSS (exploit prob.)

34th

EPSS percentile

2026-10-16

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-321

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-111636