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CVE-2026-82639

NextChat 2.15.8 through 2.16.1 OpenAI API Key Disclosure

CVSS 4.0 8.7 HIGHCVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-82639

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-82639

Published

NextChat

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "ChatGPTNextWeb",
                    "product": "NextChat",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:github/ChatGPTNextWeb/NextChat",
                    "versions": [
                        {
                            "version": "2.15.8",
                            "lessThanOrEqual": "2.16.1",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON