TI-2026-81489 Aliases CVE-2026-118132 GHSA-whxc-wj8p-jg38

Cross-site scripting in NextChat Plugin Editor

LOW 27CWE-79Published 2026-10-27 · Updated 2026-11-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

NextChat from 2.16.1 has a cross-site scripting flaw in its Plugin Editor (CWE-79). Plugin schema content loaded from a remote URL is rendered as HTML without sanitization. An attacker who hosts a malicious OpenAPI schema can trick a user into loading it through the Plugin Editor, which runs attacker JavaScript in the NextChat origin and gives access to cookies that JavaScript can read and other client-side data.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

NextChat version 2.16.1 contains a client‑side cross‑site scripting (XSS) vulnerability in the Plugin Editor due to unsafe rendering of externally supplied OpenAPI plugin schema content. When a plugin schema is loaded from a remote URL, the returned content is stored in plugin.content and later rendered using React’s dangerouslySetInnerHTML without proper sanitization. An attacker can host a malicious OpenAPI schema containing HTML or JavaScript markup and trick a user into loading it through the Plugin Editor, resulting in arbitrary JavaScript execution in the NextChat origin. Successful exploitation allows access to JavaScript‑readable cookies and other client‑side data associated with the NextChat application.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00247 16th 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: None
Automatable: No
Technical impact: Partial

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
ChatGPTNextWeb	NextChat	2.16.1	—	No fix listed	CNA

NextChat VendorChatGPTNextWeb Affected 2.16.1 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for NextChat.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Timeline

2026-10-27 Threatist record created from CVE-2026-118132
2026-10-27 Alias added: GHSA-whxc-wj8p-jg38
2026-11-04 CVSS score added · CISA ADP
2026-11-04 Weakness changed · CISA ADP
2026-11-04 CISA SSVC decision points changed

References

Other 1

https://github.com/ChatGPTNextWeb/NextChat

TI-2023-27194 NextChat vulnerable to Server-Side Request Forgery and Cross-site Scripting CVSS 3.1CRITICAL 9.8
TI-2026-56977 NextChat 2.15.8 through 2.16.1 OpenAI API Key Disclosure CVSS 4.0HIGH 8.7
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

See all 9 →

Sources

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