{"cve":"CVE-2026-54449","nvd":{"published":"2026-08-20T17:18:17.910","modified":"2026-10-18T20:10:00.110","status":"Deferred","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-77"],"references":["https://github.com/langbot-app/LangBot/security/advisories/GHSA-3pvh-63gf-j9mw","https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:49:38.260478770+00:00"},"epss":{"cve":"CVE-2026-54449","score":0.00721,"percentile":0.5366,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-3pvh-63gf-j9mw","url":"https://osv.dev/vulnerability/GHSA-3pvh-63gf-j9mw","summary":"LangBot: Authenticated RCE Via MCP Configuration","modified":"2026-07-23T15:11:25.265852536Z","packages":[{"ecosystem":"PyPI","name":"langbot","purl":"pkg:pypi/langbot","ranges":["<=4.10.5"],"fixed":[]}]},{"id":"PYSEC-2026-3473","url":"https://osv.dev/vulnerability/PYSEC-2026-3473","summary":"LangBot: Authenticated RCE Via MCP Configuration","modified":"2026-07-23T15:00:15.154722814Z","packages":[{"ecosystem":"PyPI","name":"langbot","purl":"pkg:pypi/langbot","ranges":["<=4.10.5"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}