CVE-2026-7644Public exploitNetwork attack vector

Unauthenticated code execution via exposed MCP action

Published May 2, 2026 · Updated May 2, 2026

Remote code execution in ChatGPTNextWeb NextChat 2.16.0 through 2.16.1 allows remote attackers to run OS commands via an MCP Server Action. The unauthenticated addMcpServer action accepts command and args values, persists them, and passes them to StdioClientTransport, which spawns a child process. Server-capable deployments expose the action even when MCP is disabled; static export builds are unaffected, and commands run with the server process account.

CVSS severity7.3
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in ChatGPTNextWeb NextChat 2.16.0 through 2.16.1 allows remote attackers to run OS commands via an MCP Server Action. The unauthenticated addMcpServer action accepts command and args values, persists them, and passes them to StdioClientTransport, which spawns a child process. Server-capable deployments expose the action even when MCP is disabled; static export builds are unaffected, and commands run with the server process account.

The record

CVE
CVE-2026-7644
Published
May 2, 2026
Updated
May 2, 2026
Vendor
ChatGPTNextWeb
Product
NextChat
Classifications
CWE-266, CWE-285, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 2, 2026CVE publishedPublication date reported by the CVE source.
  2. May 2, 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=2.16.0
  2. Affected versionversion=2.16.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ChatGPTNextWeb · NextChatversion=2.16.0; version=2.16.1

Published CVSS scores

5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-266Incorrect Privilege Assignment
CWE-285Improper Authorization
T1190Exploit Public-Facing Application

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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