CVE-2026-7643: ChatGPTNextWeb NextChat API Endpoint Next.js cross-domain policy

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-02 · updated 2026-10-26
Weakness: CWE-346

Description

A flaw has been found in ChatGPTNextWeb NextChat up to 2.16.1. This impacts an unknown function of the file Next.js of the component API Endpoint. Executing a manipulation can lead to permissive cross-domain policy with untrusted domains. The attack may be launched remotely. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Affected products

ChatGPTNextWeb NextChat: 2.16.0, 2.16.1

References

https://github.com/ChatGPTNextWeb/NextChat/
https://github.com/ChatGPTNextWeb/NextChat/issues/6756
https://vuldb.com/submit/806833
https://vuldb.com/vuln/360755
https://vuldb.com/vuln/360755/cti

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