CVE-2026-54449: 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…

PriorityP260high8.8CVSS 3.1

AVNACLPRLUINSUCHIHAH

EPSS

0.41%

35.0th percentile

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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
langbot-app	langbot	<= 4.10.7	—
langbot	langbot	0 – 4.10.5	—

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