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THREAT OPS › Threat News › [NVD] CVE-2026-82639 (HIGH 7.5) — 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 U

[NVD] CVE-2026-82639 (HIGH 7.5) — 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 U

highnvdPublished 2026-08-30

CVE-2026-82639 CVSS: 7.5 HIGH Published: 2026-08-30T14:17:03.750

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

MITRE ATT&CK techniques

CredentialsT1589.001

Indicators of compromise

CVE-2026-82639cve
api.openai.comdomain

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-82639