CVEvulnerability
CVE-2026-82639
8.7 HIGH
Official page ↗
- Status
- Deferred
- Published
- 2026-08-30
- Last modified
- 2026-09-10
- Assigner
- [email protected]
- CVSS 4.0 ([email protected])
- 8.7 HIGH — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- CWE-20
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.
Related
Weakness · CWE (1)
- CWE-20 Improper Input Validation weakness
References
- https://github.com/ChatGPTNextWeb/NextChat github.com
- https://github.com/ChatGPTNextWeb/NextChat/blob/v2.16.1/app/api/proxy.ts github.com
- https://github.com/ChatGPTNextWeb/NextChat/issues/6814 github.com
- https://www.vulncheck.com/advisories/nextchat-2.15.8-through-2.16.1-openai-api-key-disclosure www.vulncheck.com
- https://github.com/ChatGPTNextWeb/NextChat/issues/6814 github.com