VULNERABILITY INTELLIGENCE
CVE-2026-82639
CVSS score7.5 HIGH
EPSS probability0.51%
CISA KEVNot currently listed
Published2026-08-30
Last modified2026-09-10
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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.
Weakness classification
- disclosure@vulncheck.com: CWE-20