CVE-2026-105238 ChatGPTNextWeb NextChat Proxy Fallback proxy.ts proxyHandler server-side request forgery
Remote attackers can exploit a server-side request forgery vulnerability in the NextChat proxy handler to access internal resources or bypass security controls.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-105238?
CVE-2026-105238 is a medium-severity server-side request forgery vulnerability in ChatGPTNextWeb NextChat, published on 5 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-918
Which versions are affected by CVE-2026-105238?
How do I fix CVE-2026-105238?
No fix has been published for CVE-2026-105238 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-105238 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-105238 exists.
Sources
Also known as GHSA-rhg8-4whm-xj7w.