Improper Authorization in ChatGPTNextWeb NextChat Affects User Access
CVE-2026-7644

6.9MEDIUM

Key Information:

Vendor

Chatgptnextweb

Status
Nextchat
Vendor
CVE Published:
2 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7644?

A vulnerability has been identified in the NextChat product of ChatGPTNextWeb, specifically within the addMcpServer function found in app/mcp/actions.ts. This issue allows for improper authorization, which could potentially enable remote attackers to exploit the vulnerability for unauthorized access. Although an early notification was given to the developers through an issue report, no public response has been made. Users should assess their security posture and consider updates to mitigate the risks associated with this exploitation.

Affected Version(s)

NextChat 2.16.0

NextChat 2.16.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-7644 - Proof of Concept

References

https://vuldb.com/vuln/360756
vdb-entrytechnical-description
https://vuldb.com/vuln/360756/cti
signaturepermissions-required
https://vuldb.com/submit/806851
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Yu.Bao (VulDB User)
VulDB CNA Team
.