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TI-2026-56977 Aliases CVE-2026-82639GHSA-87fx-h8m6-gxwv

NextChat 2.15.8 through 2.16.1 OpenAI API Key Disclosure

Priority HIGH 77CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00508 43rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ChatGPTNextWebNextChat2.15.8 – 2.16.1—No fix listedCNA
  • NextChat VendorChatGPTNextWeb Affected 2.15.8 – 2.16.1 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:nextchat:nextchat:*:*:*:*:*:*:*:*——ChatGPTNextWeb
  • cpe:2.3:a:nextchat:nextchat:*:*:*:*:*:*:*:* Versions — — ·ChatGPTNextWeb

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-82639
  2. 2026-10-03 Alias added: GHSA-87fx-h8m6-gxwv

References

Other 3

  • TI-2023-27194 NextChat vulnerable to Server-Side Request Forgery and Cross-site Scripting CVSS 3.1CRITICAL 9.8
  • TI-2025-32232 Directory traversal vulnerability in NextChat thru 2.16.0 due to the WebDAV proxy failing… CVSS 3.1HIGH 7.5
  • TI-2026-67707 Server-side request forgery in NextChat Proxy Fallback proxyHandler CVSS 4.0MEDIUM 6.9
  • TI-2026-06726 ChatGPTNextWeb NextChat actions.ts addMcpServer improper authorization CVSS 4.0MEDIUM 6.9
  • TI-2026-06301 ChatGPTNextWeb NextChat Artifacts Endpoint route.ts storeUrl server-side request forgery CVSS 4.0MEDIUM 6.9
  • TI-2026-06300 ChatGPTNextWeb NextChat route.ts proxyHandler server-side request forgery CVSS 4.0MEDIUM 6.9
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences