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TI-2026-26688 Aliases CVE-2026-34403GHSA-78mf-482w-62qj

Nginx-UI vulnerable to Cross-Site WebSocket Hijacking (CSWSH) via missing origin validation on all WebSocket endpoints

Priority MEDIUM 58CWE-1385Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
None
Impact type
Tampering
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-352.

Summary

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.5, all WebSocket endpoints in nginx-ui use a gorilla/websocket Upgrader with CheckOrigin unconditionally returning true, allowing Cross-Site WebSocket Hijacking (CSWSH). Combined with the fact that authentication tokens are stored in browser cookies (set via JavaScript without HttpOnly or explicit SameSite attributes), a malicious webpage can establish authenticated WebSocket connections to the nginx-ui instance when a logged-in administrator visits the attacker-controlled page. Version 2.3.5 patches the issue.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00176 7th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed nginx-ui (0xJacky): 2.3.5github.com/0xJacky/Nginx-UI (Go): 1.9.10-0.20260316053337-1a9cd29a3082

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
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

VendorProductAffected versionsFixed inStatusSource
0xJackynginx-uibefore 2.3.52.3.5Patch availableCNA
—github.com/0xJacky/Nginx-UI (Go)before 1.9.10-0.20260316053337-1a9cd29a30821.9.10-0.20260316053337-1a9cd29a3082Patch availableGHSA-78mf-482w-62qj
  • nginx-ui Vendor0xJacky Affected before 2.3.5 Fixed in 2.3.5 Patch available CNA
  • github.com/0xJacky/Nginx-UI (Go) Vendor— Affected before 1.9.10-0.20260316053337-1a9cd29a3082 Fixed in 1.9.10-0.20260316053337-1a9cd29a3082 Patch available GHSA-78mf-482w-62qj

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nginxui:nginx_ui:*:*:*:*:*:*:*:*before 2.3.5Vulnerable0xJacky
  • cpe:2.3:a:nginxui:nginx_ui:*:*:*:*:*:*:*:* Versions before 2.3.5 Vulnerable ·0xJacky

Remediation

  • Fix · CNA nginx-ui (0xJacky) Fixed in 2.3.5
  • Fix · GHSA-78mf-482w-62qj github.com/0xJacky/Nginx-UI (Go) Fixed in 1.9.10-0.20260316053337-1a9cd29a3082 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34403
  2. 2026-10-03 Alias added: GHSA-78mf-482w-62qj

References

Exploit 1

Advisory 1

Other 2

  • TI-2026-25478 Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover CVSS 3.1CRITICAL 9.8
  • TI-2026-25472 nginx-ui Backup Restore Allows Tampering with Encrypted Backups CVSS 4.0CRITICAL 9.4
  • TI-2026-22288 Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure CVSS 3.1CRITICAL 9.8
  • TI-2024-15821 Nginx-UI arbitrary file write through the Import Certificate feature CVSS 3.1CRITICAL 9.8
  • TI-2026-70057 Code injection in Nginx UI backup restore allows code execution CVSS 4.0CRITICAL 9.4
  • TI-2026-32056 Nginx UI: Server-Side Request Forgery (SSRF) via Cluster Proxy Middleware Allows Access to Internal Services CVSS 3.1CRITICAL 9.9
See all 31 →

Sources

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