CVE-2026-54449Public exploitNetwork attack vectorHinoki check available

Authenticated command execution via STDIO MCP configuration

Published Aug 20, 2026 · Updated Aug 20, 2026

Command injection in LangBot 4.10.7 and earlier allows remote authenticated users to execute arbitrary commands via STDIO MCP settings. In src/langbot/pkg/provider/tools/loaders/mcp.py, the Extensions MCP flow passes user-controlled command and arguments into StdioServerParameters, which starts a server-side subprocess from that input. Any user who can sign up or obtain an account can reach this setting and run code with the LangBot service's privileges, enabling data disclosure, data modification, or service disruption.

CVSS severity8.8
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Command injection in LangBot 4.10.7 and earlier allows remote authenticated users to execute arbitrary commands via STDIO MCP settings. In src/langbot/pkg/provider/tools/loaders/mcp.py, the Extensions MCP flow passes user-controlled command and arguments into StdioServerParameters, which starts a server-side subprocess from that input. Any user who can sign up or obtain an account can reach this setting and run code with the LangBot service's privileges, enabling data disclosure, data modification, or service disruption.

The record

CVE
CVE-2026-54449
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
LangBot
Product
LangBot
Classifications
CWE-77, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 4.10.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

LangBot · LangBotversion=<= 4.10.7

Published CVSS scores

8.8GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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