# CVE-2026-107813: Nginx UI incomplete fix of authentication bypass in cluster router

Source: https://junglewise.ai/threats/cve-2026-107813-nginx-ui-incomplete-fix-of-the-api-cluster-router-was-not  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-09. Updated: 2026-10-09  
License: CC BY 4.0 with a link back

CVE-2026-107813 · Severity: high · CVSS 8.8 · Published 2026-10-09

Nginx UI, a management interface for Nginx web servers, requires users to complete an additional authentication step (OTP) before performing sensitive operations. A recent fix applied this protection to single-node operations but missed the cluster management section. An attacker with a stolen authentication token can bypass this additional authentication step to add, modify, or delete cluster nodes—including stealing node credentials—and trigger cluster-wide Nginx restarts without completing the OTP step.

Technologies: [github.com/0xJacky/Nginx-UI (Go)](https://junglewise.ai/threats/technologies/github-com-0xjacky-nginx-ui), [Nginx UI](https://junglewise.ai/threats/technologies/nginx-ui-nginx-ui). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [Nginx UI](https://junglewise.ai/threats/vendors/nginx-ui).

## Quick answers

**Is CVE-2026-107813 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-107813 being exploited in the wild.

**How severe is CVE-2026-107813?** High severity, with a CVSS score of 8.8, published 9 October 2026.

**Which products and versions are affected?** github.com/0xJacky/Nginx-UI (Go) >= 1.9.10-0.20250517140552-daee3ac7ade1, < 1.9.10-0.20260728074433-a3999bd78a3b, SEMVER:introduced=1.9.10-0.20250517140552-daee3ac7ade1,fixed=1.9.10-0.20260728074433-a3999bd78a3b; Nginx UI <UNKNOWN>.

**Is there a fix for CVE-2026-107813?** Yes. github.com/0xJacky/Nginx-UI (Go): upgrade to 1.9.10-0.20260728074433-a3999bd78a3b or later. Until then: Wrap the cluster router's mutation handlers (node CRUD, nodes/reload_nginx, nodes/restart_nginx, namespace CRUD) in middleware.RequireSecureSession() to match the protection applied to the nginx router, ensuring all sensitive operations require OTP step-up verification.</anigation>
</invoke> Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-107813 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-107813?** Check whether you run github.com/0xJacky/Nginx-UI (Go) or Nginx UI at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/0xJacky/Nginx-UI (Go): upgrade to 1.9.10-0.20260728074433-a3999bd78a3b or later

  ```sh
  go get github.com/0xJacky/Nginx-UI@v1.9.10-0.20260728074433-a3999bd78a3b
  ```


Wrap the cluster router's mutation handlers (node CRUD, nodes/reload_nginx, nodes/restart_nginx, namespace CRUD) in middleware.RequireSecureSession() to match the protection applied to the nginx router, ensuring all sensitive operations require OTP step-up verification.</anigation>
</invoke>

## Technical details

The vulnerability is an incomplete fix of a prior authentication bypass: while the nginx router wraps mutation handlers (reload/restart) in middleware.RequireSecureSession() to enforce OTP step-up, the parallel api/cluster router registers node CRUD, node reload/restart, and namespace CRUD operations directly on the authenticated group without the same middleware wrapper. An authenticated attacker with a stolen or persisted JWT but no fresh X-Secure-Session-ID can invoke POST /api/nodes, POST /api/nodes/reload_nginx, and other cluster mutations that are gated only by AuthRequired middleware, allowing read/write of node tokens and cluster-wide nginx restarts.

## Affected products

- Nginx UI Nginx UI <UNKNOWN>

## Identifiers

- CVE-2026-107813
- GHSA-h246-wpgf-vmq5
- GO-2026-6706

## Timeline

- 2026-10-09: disclosed: GHSA-h246-wpgf-vmq5 published

## Related threats

- [Nginx UI Casdoor SSO login CSRF via constant state parameter](https://junglewise.ai/threats/cve-2026-84312-nginx-ui-casdoor-sso-callback-uses-a-constant-state-parameter)
- [Nginx UI OTP secure-session step-up bypass via MCP](https://junglewise.ai/threats/cve-2026-84360-nginx-ui-otp-secure-session-step-up-can-be-bypassed-via-mcp)
- [Nginx UI short token cache bypass after account re-enable](https://junglewise.ai/threats/cve-2026-84321-nginx-ui-standalone-short-tokens-survive-administrative)
- [Nginx UI auto backup path traversal in storage boundary](https://junglewise.ai/threats/cve-2026-84320-nginx-ui-auto-backup-name-allows-path-traversal-outside-validated)
- [Nginx UI MCP configuration directive validation bypass](https://junglewise.ai/threats/cve-2026-84319-nginx-ui-mcp-configuration-tools-bypass-restricted-directive)