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CVE-2026-54449— LangBot: Authenticated RCE Via MCP Configuration

Quick assessment

Affected
langbot-app LangBot
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LangBot 是一个面向大语言模型（LLM）的全球即时通讯（IM）机器人平台。在 4.10.7 及更早版本中，任何经过身份验证的用户均可在缺乏充分权限边界控制的情况下，添加或修改 STDIO MCP 服务器的配置。在代码文件 中， 接受已配置的命令及其参数，并在 LangBot 服务器上启动一个服务端子进程。攻击者若能注册账号或获取现有账号，便可通过 Extensions MCP 配置功能，以 LangBot 服务的权限执行任意命令，从而导致数据泄露、数据篡改和服务中断。截至本次审查时，尚无修复版本可用。

CVSS 8.8 · High EPSS 0.41% · P34

Affected Version Matrix 1

VendorProduct Version RangeStatus
langbot-app LangBot <= 4.10.7 affected
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I. Basic Information for CVE-2026-54449

Vulnerability Information
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Vulnerability Title
LangBot: Authenticated RCE Via MCP Configuration
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
langbot-app LangBot <= 4.10.7 -

II. Public POCs for CVE-2026-54449

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7069 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
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III. Intelligence Information for CVE-2026-54449

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Vendor Advisories for CVE-2026-54449 (1)

IV. Related Vulnerabilities

Same product: LangBot
Same vendor: langbot-app
Same weakness: CWE-77

V. Comments for CVE-2026-54449

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