This vulnerability in ChatGPTNextWeb NextChat (<= 2.16.1) arises from a permissive cross-domain policy implemented in an API endpoint within the Next.js component. This misconfiguration allows untrusted domains to bypass same-origin restrictions, potentially enabling unauthorized cross-origin interactions. The flaw can be triggered remotely without authentication or user interaction, increasing its risk profile. Despite early reporting, the vendor has not issued a patch or official remediation guidance. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no privileges required, user interaction required, no confidentiality or availability impact, and low integrity impact.

The vulnerability permits untrusted domains to interact with the affected application due to an overly permissive cross-domain policy. This could lead to unauthorized cross-origin requests or data exposure depending on the application context. However, the CVSS score and vector indicate no direct confidentiality or availability impact, and only low integrity impact. No known exploits are reported in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the vendor has not responded or released a fix, users should monitor official channels for updates. In the meantime, restricting cross-origin policies manually or applying web application firewall rules to limit cross-domain requests may reduce exposure. Avoid deploying affected versions in sensitive environments until a fix is available.