CVE-2026-105238: Chatgptnextweb Nextchat

High severity, CVSS 7.3. EPSS: 0.4% chance of exploitation in the next 30 days.

A flaw has been found in ChatGPTNextWeb NextChat up to 2.16.1. This vulnerability affects the function proxyHandler of the file app/api/proxy.ts of the component Proxy Fallback Handler. This manipulation of the argument x-base-url causes server-side request forgery. It is possible to initiate the attack remotely. The exploit has been published and may be used. The pull request to fix this issue awaits acceptance.

Affected products

• Chatgptnextweb Nextchat: version 2.16.0 only; version 2.16.1 only

Published 2026-10-05. Last modified 2026-10-06.