High severity7.5NVD Advisory· Published Aug 30, 2026· Updated Sep 10, 2026
CVE-2026-82639
CVE-2026-82639
Description
NextChat versions from 2.15.8 through 2.16.1 contain an improper URL validation vulnerability in the proxy endpoint that allows attackers to obtain the server's OpenAI API key. The x-base-url header is validated using substring matching instead of hostname parsing, allowing any URL containing 'api.openai.com' to pass validation and receive the server's credentials in the Authorization header.
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Affected products
1- Range: 2.15.8 - 2.16.1
Patches
Vulnerability mechanics
References
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