TI-2026-67707 Aliases CVE-2026-105238 GHSA-rhg8-4whm-xj7w

Server-side request forgery in NextChat Proxy Fallback proxyHandler

HIGH 70CWE-918Published 2026-10-05 · Updated 2026-10-05

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: Low · Low · Low
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

ChatGPTNextWeb NextChat up to 2.16.1 is affected. Manipulating the x-base-url argument of the proxyHandler function in app/api/proxy.ts causes server-side request forgery (CWE-918). A remote attacker without privileges or user interaction can make the server send requests to destinations of their choice. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00414 36th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
ChatGPTNextWeb	NextChat	2.16.0; 2.16.1	—	No fix listed	CNA

NextChat VendorChatGPTNextWeb Affected 2.16.0; 2.16.1 Fixed in — No fix listed CNA

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:nextchat:nextchat::::::::	—	—	ChatGPTNextWeb

cpe:2.3:a:nextchat:nextchat:*:*:*:*:*:*:*:* Versions — — ·ChatGPTNextWeb

Remediation

The sources list no fixed version for NextChat. A pull request to fix this issue awaits acceptance.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

2026-10-05 Threatist record created from CVE-2026-105238
2026-10-05 Alias added: GHSA-rhg8-4whm-xj7w

References

TI-2023-27194 NextChat vulnerable to Server-Side Request Forgery and Cross-site Scripting CVSS 3.1CRITICAL 9.8
TI-2026-56977 NextChat 2.15.8 through 2.16.1 OpenAI API Key Disclosure CVSS 4.0HIGH 8.7
TI-2025-32232 Directory traversal vulnerability in NextChat thru 2.16.0 due to the WebDAV proxy failing… CVSS 3.1HIGH 7.5
TI-2026-06726 ChatGPTNextWeb NextChat actions.ts addMcpServer improper authorization CVSS 4.0MEDIUM 6.9
TI-2026-06301 ChatGPTNextWeb NextChat Artifacts Endpoint route.ts storeUrl server-side request forgery CVSS 4.0MEDIUM 6.9
TI-2026-06300 ChatGPTNextWeb NextChat route.ts proxyHandler server-side request forgery CVSS 4.0MEDIUM 6.9

See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences