by Kastro
Paper/Archive/CVE-2026-111636

CVE-2026-111636

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

EPSS 0.4%CVSS 9.2
critical.is priorityof 100
35
CVSS 9.2 (CNA)9.2 / 10 × 3027.6Not in CISA KEV+300.0EPSS percentile 34.4.344 × 206.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
StaffDeck≤ 0.5.6–CNA

Scores by source

VulnCheck (CNA)9.2CVSS: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 (CNA)8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

writeuphackmd.io/@hieuPenguinnn/staffdeck-default-token-signing-secret-auth-bypasswriteupgithub.com/OpenBMB/StaffDeck/blob/v0.5.6/backend/app/config.py#L10writeupgithub.com/OpenBMB/StaffDeck/blob/v0.5.6/backend/app/security/auth.py#L96-L98writeupvulncheck.com/advisories/openbmb-staffdeck-through-0.5.6-authentication-bypass-via-hard-coded-session-secret