TI-2026-06726 Aliases CVE-2026-7644 GHSA-2jqp-6hx7-phh8

ChatGPTNextWeb NextChat actions.ts addMcpServer improper authorization

HIGH 70CWE-266Published 2026-05-02 · Updated 2026-05-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Privilege escalation, Security bypass
Confidentiality · integrity · availability: Low · Low · Low
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-266 and CWE-285.

Summary

A vulnerability has been found in ChatGPTNextWeb NextChat up to 2.16.1. Affected is the function addMcpServer of the file app/mcp/actions.ts. The manipulation leads to improper authorization. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00309 23rd 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 Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

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

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

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-7644
2026-10-03 Alias added: GHSA-2jqp-6hx7-phh8

References

Exploit 1

https://github.com/ChatGPTNextWeb/NextChat/issues/6757

Other 1

https://github.com/ChatGPTNextWeb/NextChat/

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-2026-67707 Server-side request forgery in NextChat Proxy Fallback proxyHandler 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