CVE-2026-84319 (GCVE-0-2026-84319)

Vulnerability from cvelistv5 – Published: 2026-10-12 21:03 – Updated: 2026-10-12 21:03
VLAI
Title
Nginx UI: MCP configuration tools bypass restricted directive validation and allow secondary authenticated users to execute NJS in Nginx worker context
Summary
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.
Severity
8.3 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
CWE
  • CWE-693 - Protection Mechanism Failure
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7566 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
0xJacky nginx-ui Affected: < 2.4.1
guessed Create a notification for this product.
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nginx-ui",
          "vendor": "0xJacky",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.4.1"
            }
          ]
        }
      ],
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        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-693",
              "description": "CWE-693: Protection Mechanism Failure",
              "lang": "en",
              "type": "CWE"
            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-12T21:03:36.112Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-5r62-gj48-897x",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-5r62-gj48-897x"
        },
        {
          "name": "https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2"
        },
        {
          "name": "https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1"
        }
      ],
      "source": {
        "advisory": "GHSA-5r62-gj48-897x",
        "discovery": "UNKNOWN"
      },
      "title": "Nginx UI: MCP configuration tools bypass restricted directive validation and allow secondary authenticated users to execute NJS in Nginx worker context"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-84319",
    "datePublished": "2026-10-12T21:03:36.112Z",
    "dateReserved": "2026-09-01T16:17:43.080Z",
    "dateUpdated": "2026-10-12T21:03:36.112Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
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        "affected": [
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              {
                "product": "nginx-ui",
                "vendor": "0xJacky",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 2.4.1"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "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."
          }
        ],
        "id": "CVE-2026-84319",
        "lastModified": "2026-10-12T21:17:22.517",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.3,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "LOW",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H",
                "version": "3.1"
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              "impactScore": 5.5,
              "source": "security-advisories@github.com",
              "type": "Secondary"
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        "references": [
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            "url": "https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-5r62-gj48-897x"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Received",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-693"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



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