High 7.5Published Aug 30, 2026

CVE-2026-82639NextChat 2.15.8 through 2.16.1 OpenAI API Key Disclosure

Updated under an hour ago (2026-10-19 07:30 UTC)

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It affects ChatGPTNextWeb NextChat. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for ChatGPTNextWeb NextChat

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-20
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Sep 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

ChatGPTNextWeb NextChat chatgptnextweb:nextchat (from the name)	from 2.15.8 through 2.16.1	CNA record

References

https://github.com/ChatGPTNextWeb/NextChat/issues/6814issue-tracking
https://github.com/ChatGPTNextWeb/NextChatproduct
https://github.com/ChatGPTNextWeb/NextChat/blob/v2.16.1/app/api/proxy.tstechnical-description
https://www.vulncheck.com/advisories/nextchat-2.15.8-through-2.16.1-openai-api-key-disclosurethird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.