CVE Catalog

CVE-2026-54449

HighCVSS 8.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.41%

34th percentile - higher than 34% of all known CVEs

Summary

LangBot version 4.10.7 and earlier has a vulnerability that allows any authenticated user to add or change an STDIO MCP server configuration without an adequate authorization boundary. An attacker can configure commands and arguments that are executed as a subprocess on the LangBot server, enabling arbitrary command execution with LangBot service privileges.

Risk Assessment

An attacker could execute arbitrary commands on the server, potentially leading to data disclosure, modification, or service disruption.

Recommendation

Apply patches or update LangBot if available. Restrict MCP configuration to trusted users.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS