---
id: "CVE-2026-111636"
kind: "vulnerability"
aliases: ["CVE-2026-111636"]
title: "OpenBMB StaffDeck through 0.5.6 contains an authentication bypass vulnerability that allows unauthenticated\u2026"
severity: "critical"
cvss: 9.2
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["other", "self-hosted", "staffdeck"]
not_affected_if: ["default-config-changed", "versions-after-0.5.6"]
published_at: "2026-10-16T18:17:44+00:00"
first_seen_at: "2026-10-23T21:57:13+00:00"
updated_at: "2026-10-23T22:28:55+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111636", "first_seen_at": "2026-10-23T21:57:13+00:00"}]
---

# OpenBMB StaffDeck through 0.5.6 contains an authentication bypass vulnerability that allows unauthenticated…

OpenBMB StaffDeck through 0.5.6 signs session tokens with a hard-coded default app_secret. An unauthenticated attacker can forge an HMAC-SHA256 token for the seeded 'admin' user in 'tenant_demo' and gain full tenant administration, including stored model and channel credentials.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

Check whether the app_secret setting still equals the shipped default value. Confirm which StaffDeck version is deployed (0.5.6 and earlier are affected per the sources).

## Fix

Set a unique, random app_secret in place of the default, and rotate any model and channel credentials stored in the tenant. A fixed release is not named in the sources; upgrade past 0.5.6 once the vendor publishes one.

## Timeline

- 2026-10-23T21:57:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-111636

## From the sources

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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_