Read the docs
TI-2026-71319 Aliases CVE-2026-84319GHSA-5r62-gj48-897x

Nginx UI MCP tools bypass restricted Nginx directive validation

Priority LOW 36CWE-693Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-693.

Summary

Nginx UI before 2.4.1 has a protection mechanism failure (CWE-693) in its MCP configuration interface. The regular HTTP configuration API rejects restricted directives, but the MCP interface lets a secondary authenticated user write and apply equivalent restricted content. This lets that low-privileged user execute attacker-controlled NJS in the Nginx worker context.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, the regular HTTP configuration API rejects restricted Nginx directives such as load_module, js_import, and js_content. However, the MCP configuration interface allows a secondary authenticated user to write and apply equivalent restricted configuration content. This allows the user to load ngx_http_js_module.so, import attacker-controlled JavaScript, reload Nginx, and execute NJS in the Nginx worker context. This issue is fixed in version 2.4.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0028 20th percentileScored 2026-11-07
Fix Fixed nginx-ui (0xJacky): 2.4.1github.com/0xJacky/Nginx-UI (Go): 1.9.10-0.20260703131214-23d1934099b0

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

VendorProductAffected versionsFixed inStatusSource
0xJackynginx-uibefore 2.4.12.4.1Patch availableCNA
—github.com/0xJacky/Nginx-UI (Go)before 1.9.10-0.20260703131214-23d1934099b01.9.10-0.20260703131214-23d1934099b0Patch availableGHSA-5r62-gj48-897x
  • nginx-ui Vendor0xJacky Affected before 2.4.1 Fixed in 2.4.1 Patch available CNA
  • github.com/0xJacky/Nginx-UI (Go) Vendor— Affected before 1.9.10-0.20260703131214-23d1934099b0 Fixed in 1.9.10-0.20260703131214-23d1934099b0 Patch available GHSA-5r62-gj48-897x

CPE names Threatist (inferred) · 1

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

CPEVersionsRoleVendor
cpe:2.3:a:nginxui:nginx_ui:*:*:*:*:*:*:*:*——0xJacky
  • cpe:2.3:a:nginxui:nginx_ui:*:*:*:*:*:*:*:* Versions — — ·0xJacky

Remediation

Update nginx-ui to version 2.4.1, which fixes this issue. The github.com/0xJacky/Nginx-UI Go module is fixed in version 1.9.10-0.20260703131214-23d1934099b0.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA nginx-ui (0xJacky) Fixed in 2.4.1
  • Fix · GHSA-5r62-gj48-897x github.com/0xJacky/Nginx-UI (Go) Fixed in 1.9.10-0.20260703131214-23d1934099b0 Advisory →

Timeline

  1. 2026-10-12 Threatist record created from CVE-2026-84319
  2. 2026-10-13 Priority changed: MEDIUM → LOW
  3. 2026-10-13 CISA SSVC decision points changed
  4. 2026-10-16 Alias added: GHSA-5r62-gj48-897x
  5. 2026-10-16 Fix available: Go/github.com/0xJacky/[email protected] · GHSA-5r62-gj48-897x
  6. 2026-10-16 CVSS score added · GHSA-5r62-gj48-897x
  7. 2026-10-16 Weakness changed · GHSA-5r62-gj48-897x
  8. 2026-10-16 5 new references · GHSA-5r62-gj48-897x

References

Advisory 1

Other 4

  • 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 43 →

Sources

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