---
id: CVE-2026-54449
title: LangBot is a global IM bot platform designed for LLMs
summary: >-
  LangBot is a global IM bot platform designed for LLMs. In version 4.10.7 and
  earlier, any authenticated user can add or change an STDIO MCP server
  configuration without an adequate authorization boundary. In
  src/langbot/pkg/provider/tool…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-77
vendor: langbot
product: langbot
affected:
  - langbot <= 4.10.5
published: '2026-08-20'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54449'
references:
  - url: >-
      https://github.com/langbot-app/LangBot/security/advisories/GHSA-3pvh-63gf-j9mw
    label: security-advisories@github.com
  - url: >-
      https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-3pvh-63gf-j9mw'
tags:
  - nvd
  - ghsa
  - pip
epss: 0.00721
epssPercentile: 0.52041
aliases:
  - GHSA-3pvh-63gf-j9mw
ecosystem: pip
ingestedAt: '2026-07-15T17:44:34.465Z'
---

## Overview

LangBot is a global IM bot platform designed for LLMs. In version 4.10.7 and earlier, any authenticated user can add or change an STDIO MCP server configuration without an adequate authorization boundary. In src/langbot/pkg/provider/tools/loaders/mcp.py, StdioServerParameters accepts the configured command and arguments and starts a server-side subprocess on the LangBot server. An attacker who can sign up or obtain an account can use the Extensions MCP configuration to execute arbitrary commands with the privileges of the LangBot service, enabling data disclosure, modification, and service disruption. No fixed version is available as of this review.

## Remediation

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

## Package advisory (CVE-2026-54449)

Affected packages:

- `langbot <= 4.10.5`

Source: https://github.com/advisories/GHSA-3pvh-63gf-j9mw