CVE-2026-54449: fallo de gravedad alta en langbot-app LangBot
LangBot: Authenticated RCE Via MCP Configuration
Publicada el · Actualizada el
Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.
21Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Trackcvss 8.8epss 0.7%
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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Productos afectados
langbot-app · LangBotCVEs relacionadas — langbot-app LangBot
En el mismo producto, de las más peligrosas a las menos.
CVE-2026-90562CRITICALLangBot before 4.10.11 Authentication Bypass via Weak Recovery KeyEPSS 0.7%CVE-2026-90938HIGHLangBot through 0.4.17 Unauthenticated Plugin Registration via WebSocketEPSS 0.6%CVE-2025-59835HIGHLangBot has a cross-directory file upload vulnerability, which could lead to system takeoverEPSS 0.4%CVE-2026-28509MEDIUMLangBot has a Cross Site Scripting(XSS) VulnerabilityEPSS 0.2%CVE-2026-112265HIGHLangBot through 4.11.0 Missing Lark/Feishu Webhook Authenticity VerificationEPSS 0.2%