- 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
- security-advisories@github.com
- NVD status
- Received
CVSS 3.1
- Type
- Secondary
- Base score
- 8.8
- Impact score
- 5.9
- Exploitability score
- 2.8
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Severity
- HIGH
- security-advisories@github.com
- CWE-77
- Hype score
- Not currently trending
I officially got another CVE (CVE-2026-54449) for the MCP STDIO vulnerability family which was disclosed back in April, this one is on LangBot! https://t.co/tYooM4mY8L
@MosheTov
15 Jun 2026
611 Impressions
3 Retweets
9 Likes
1 Bookmark
1 Reply
0 Quotes
I officially got another CVE (CVE-2026-54449) for the MCP STDIO vulnerability family which was disclosed back in January, this one is on LangBot! https://t.co/PILhAROlPk
@MosheTov
15 Jun 2026
15 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes