CVE-2026-7644CWE-266CWE-285

ChatGPTNextWeb NextChat actions.ts addMcpServer improper authorization

Medium · published May 2, 2026

CVSS v4.0
6.9
EPSS
1%
Percentile
42.9
In the wild
Unconfirmed
What it is

A vulnerability has been found in ChatGPTNextWeb NextChat up to 2.16.1. Affected is the function addMcpServer of the file app/mcp/actions.ts. The manipulation leads to improper authorization. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
CVSS: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
EPSS
0.00513 · 42.9th percentile
Weaknesses
CWE-266 · Incorrect Privilege Assignment; CWE-285 · Improper Authorization
Published
2026-05-02T15:00Z
EPSS history
Timeline
  • 02 MAY 15:00Z
    ChatGPTNextWeb NextChat actions.ts addMcpServer improper authorization
    cvelistv5