---
id: CVE-2026-111636
title: >-
  OpenBMB StaffDeck through 0.5.6 Authentication Bypass via Hard-Coded Session
  Secret
summary: >-
  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 …
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-321
vendor: OpenBMB
product: StaffDeck
affected:
  - StaffDeck <= 0.5.6
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T20:51:52.034848Z'
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T21:19:00.346Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111636'
references:
  - url: >-
      https://hackmd.io/@hieuPenguinnn/staffdeck-default-token-signing-secret-auth-bypass
  - url: 'https://github.com/OpenBMB/StaffDeck/blob/v0.5.6/backend/app/config.py#L10'
  - url: >-
      https://github.com/OpenBMB/StaffDeck/blob/v0.5.6/backend/app/security/auth.py#L96-L98
  - url: >-
      https://www.vulncheck.com/advisories/openbmb-staffdeck-through-0.5.6-authentication-bypass-via-hard-coded-session-secret
    label: >-
      VulnCheck Advisory: OpenBMB StaffDeck through 0.5.6 Authentication Bypass
      via Hard-Coded Session Secret
tags:
  - cve.org
ingestedAt: '2026-10-16T18:43:08.684Z'
---

## Overview

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

- `StaffDeck <= 0.5.6`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.