Server-Side Request Forgery Vulnerability in ChatGPTNextWeb NextChat
CVE-2026-105238

6.9MEDIUM

Key Information:

Vendor

Chatgptnextweb

Status
Nextchat
Vendor
CVE Published:
5 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-105238?

A vulnerability exists in ChatGPTNextWeb's NextChat application, specifically in the proxyHandler function of the app/api/proxy.ts file. This flaw arises from improper handling of the 'x-base-url' argument, which allows attackers to perform server-side request forgery. This can be exploited remotely, posing a significant security threat. Developers have acknowledged the issue, and a pull request to address this vulnerability is currently pending acceptance.

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-2026-105238 - Proof of Concept

References

https://vuldb.com/vuln/413450
vdb-entrytechnical-description
https://vuldb.com/vuln/413450/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-105238
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

geochen (VulDB User)
VulDB CNA Team
.