Is CVE-2026-82639 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-82639?

CVE-2026-82639 has a CVSS v3 severity of HIGH (7.5).

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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.