Nginx UI: OTP secure-session step-up can be bypassed via MCP configuration tools

{
  "id": "a80581244c141405f86a9c7eeac67d064dc9f7400c38be8c7d75adc4d8b69c11",
  "url": "https://osv.dev/vulnerability/GHSA-vc32-4gwf-77xp",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Nginx UI: OTP secure-session step-up can be bypassed via MCP configuration tools",
    "summary": "### Summary An OTP-enabled authenticated user who cannot use the HTTP configuration mutation endpoints without a valid secure session can still mutate Nginx configuration through `/mcp` and `/mcp_message` using only ordinary authentication. ### Details The HTTP configuration mutation surface is explicitly grouped behind `middleware.RequireSecureSession()`. By contrast, the MCP endpoints are exposed with only `middleware.AuthRequired()`. The MCP server exposes configuration mutation tools including `nginx_config_add` and `nginx_config_modify`, so OTP-enabled users gain an alternate path around the intended step-up requirement. Relevant code paths: - [api/config/router.go](/home/kali/Desktop/bounty/nginx-ui/api/config/router.go:14) - [internal/middleware/secure_session.go](/home/kali/Desktop/bounty/nginx-ui/internal/middleware/secure_session.go:52) - [mcp/router.go](/home/kali/Desktop/bounty/nginx-ui/mcp/router.go:9) - [mcp/config/config_add.go](/home/kali/Desktop/bounty/nginx-ui/mcp/config/config_add.go:34) - [mcp/config/config_modify.go](/home/kali/Desktop/bounty/nginx-ui/mcp/config/config_modify.go:55) This is a security-control bypass rather than a missing feature. The product already established that OTP-enabled users should complete a secure session before high-impact configuration mutations are accepted on the HTTP path. ### PoC I verified this locally in an isolated environment with a temporary end-to-end harness that exercised the real `/mcp` and `/mcp_message` routes.",
    "evidence": "osv:GHSA-vc32-4gwf-77xp",
    "products": [
      {
        "name": {
          "value": "github.com/0xJacky/Nginx-UI",
          "evidence": "/affected/0/package/name"
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        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.9.10-0.20260703131214-23d1934099b0",
            "evidence": "/affected/0/ranges"
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        "affected_versions": []
      }
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    "severity": "high",
    "structured": {
      "id": "GHSA-vc32-4gwf-77xp",
      "aliases": [
        "CVE-2026-84360",
        "GHSA-vc32-4gwf-77xp",
        "GO-2026-6799"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"
        }
      ],
      "affected": [
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          "ranges": [
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              "events": [
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                  "fixed": "1.9.10-0.20260703131214-23d1934099b0"
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            "purl": "pkg:golang/github.com/0xJacky/Nginx-UI",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-vc32-4gwf-77xp/GHSA-vc32-4gwf-77xp.json"
          }
        }
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      "modified": "2026-10-19T21:41:02.724775704Z",
      "provider": "osv",
      "references": [
        "https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-vc32-4gwf-77xp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-84360",
        "https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2",
        "https://github.com/0xJacky/nginx-ui",
        "https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1"
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        "cwe_ids": [
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        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-12T21:17:22Z",
        "github_reviewed_at": "2026-10-15T20:14:10Z"
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        "evidence": "/aliases"
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    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
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  "source_id": "core-osv",
  "document_id": 376769,
  "published_at": "2026-10-15T20:14:10+00:00"
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{
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  "url": "https://osv.dev/vulnerability/GO-2026-6799",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Nginx UI: OTP secure-session step-up can be bypassed via MCP configuration tools in github.com/0xJacky/Nginx-UI",
    "summary": "Nginx UI: OTP secure-session step-up can be bypassed via MCP configuration tools in github.com/0xJacky/Nginx-UI",
    "evidence": "osv:GO-2026-6799",
    "products": [
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          "value": "github.com/0xJacky/Nginx-UI",
          "evidence": "/affected/0/package/name"
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            "evidence": "/affected/0/ranges"
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        "affected_versions": []
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    "severity": "unknown",
    "structured": {
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      "aliases": [
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        "GHSA-vc32-4gwf-77xp",
        "GO-2026-6799"
      ],
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              "type": "SEMVER",
              "events": [
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            "purl": "pkg:golang/github.com/0xJacky/Nginx-UI",
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      "modified": "2026-10-19T21:31:53.417011797Z",
      "provider": "osv",
      "references": [
        "https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-vc32-4gwf-77xp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-84360",
        "https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2",
        "https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1"
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        "url": "https://pkg.go.dev/vuln/GO-2026-6799",
        "review_status": "UNREVIEWED"
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    "security_relevant": true,
    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 376720,
  "published_at": "2026-10-19T21:08:35+00:00"
}