CVE-2026-82639— NextChat 2.15.8 through 2.16.1 OpenAI API Key Disclosure
Quick assessment
Affected
ChatGPTNextWeb NextChat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
NextChat 2.15.8 至 2.16.1 版本的代理端点中存在一个 URL 校验不当的漏洞，攻击者可借此获取服务器的 OpenAI API 密钥。具体来说， 请求头在验证时采用了子串匹配而非域名解析，因此任何包含 的 URL 都能通过校验，并在 请求头中返回服务器的凭据。
Possible ATT&CK Techniques 1 AI
T1572.001
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I. Basic Information for CVE-2026-82639
Vulnerability Information
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Vulnerability Title
NextChat 2.15.8 through 2.16.1 OpenAI API Key Disclosure
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| ChatGPTNextWeb | NextChat | 2.15.8 ~ 2.16.1 | - |
|
II. Public POCs for CVE-2026-82639
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-82639 (1)
-
🔗 NextChat 2.15.8 through 2.16.1 OpenAI API Key Disclosure | Advisories | VulnCheck third-party-advisory
Proof of Concept for CVE-2026-82639 (2)
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🔗 NextChat/app/api/proxy.ts at v2.16.1 · ChatGPTNextWeb/NextChat · GitHub Read full article technical-description
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IV. Related Vulnerabilities
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V. Comments for CVE-2026-82639
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