Permissive CORS Policy in ChatGPTNextWeb NextChat Affects API Endpoint Functionality
CVE-2026-7643

5.3MEDIUM

Key Information:

Vendor

Chatgptnextweb

Status
Nextchat
Vendor
CVE Published:
2 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7643?

A vulnerability identified in ChatGPTNextWeb's NextChat version 2.16.1 allows for a permissive CORS policy, placing users at risk for cross-domain attacks. The flaw resides in an unspecified function within the Next.js component of the API endpoint, which could be exploited to allow untrusted domains to interact with the application. This manipulation can be executed remotely, increasing the potential threat level. While the project team was alerted about the issue through an issue report, no acknowledgment or remediation has been communicated.

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-2026-7643 - Proof of Concept

References

https://vuldb.com/vuln/360755
vdb-entry
https://vuldb.com/vuln/360755/cti
signaturepermissions-required
https://vuldb.com/submit/806833
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Yu_Bao (VulDB User)
VulDB CNA Team
.