CVE-2026-82639

Summary

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.

Affected Software

Weaknesses

• CWE-20: Improper Input Validation

References

• https://github.com/ChatGPTNextWeb/NextChat/issues/6814
• https://github.com/ChatGPTNextWeb/NextChat
• https://github.com/ChatGPTNextWeb/NextChat/blob/v2.16.1/app/api/proxy.ts
• https://www.vulncheck.com/advisories/nextchat-2.15.8-through-2.16.1-openai-api-key-disclosure

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