GCVE-1988-2026-0117

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "advisory Pre-authentication",
          "vendor": "Security",
          "versions": [
            {
              "status": "affected",
              "version": "unknown"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "disclosure via Fulldisclosure"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "0day Rubbish Research Team is publicly disclosing a vulnerability in iMonnit Express 4.0.5.5 (Monnit / iMonnit). The \nresearch is published and a proof-of-concept is available.\n\nPre-authentication SYSTEM RCE (CVSS 9.8, pre-authentication)\n\niMonnit Express 4.0.5.5 is an ASP.NET Core application running as a Windows service with LocalSystem privileges, with \nno global [Authorize] filter. Three flaws combine into a fully unauthenticated root RCE chain: an auth bypass (an empty \nsecurity answer list issues a valid admin cookie), a path-traversal file write in the certificate upload endpoint \n(reachable with the forged cookie), and a plugin loader that calls Assembly.Load + Activator.CreateInstance on the \nplugin's parameterless constructor BEFORE the IExpressPlugin check - the constructor runs as LocalSystem. Dynamically \nverified: whoami = nt authority\\system.\n\nImpact: Full read of the host filesystem and configuration as NT AUTHORITY\\SYSTEM, arbitrary OS command execution, and \nfull control of the iMonnit Express host.\n\nAdvisory: https://0day-rubbish.com/blog/imonnit-express-unauth-plugin-rce\n\nPoC and full analysis: https://github.com/Exploit-Garbage/0day-Rubbish\n\n-- \n0day Rubbish Research Team\nhttps://0day-rubbish.com\n_______________________________________________\nSent through the Full Disclosure mailing list\nhttps://nmap.org/mailman/listinfo/fulldisclosure\nWeb Archives & RSS: https://seclists.org/fulldisclosure/"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-11T11:50:54Z",
        "orgId": "4e2abfbf-4a2a-4b76-a4e0-d77c18ba156c",
        "shortName": "VULNARCHIVE"
      },
      "references": [
        {
          "tags": [
            "technical-description",
            "exploit"
          ],
          "url": "https://vuln.freearchive.org/archive/full-disclosure/2026/Aug/54"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://seclists.org/fulldisclosure/2026/Aug/54"
        },
        {
          "url": "https://0day-rubbish.com"
        },
        {
          "url": "https://0day-rubbish.com/blog/imonnit-express-unauth-plugin-rce"
        },
        {
          "url": "https://github.com/Exploit-Garbage/0day-Rubbish"
        },
        {
          "url": "https://nmap.org/mailman/listinfo/fulldisclosure"
        },
        {
          "url": "https://seclists.org/fulldisclosure/"
        }
      ],
      "source": {
        "defect": [
          "https://seclists.org/fulldisclosure/2026/Aug/54"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "Security advisory: Pre-authentication SYSTEM RCE in iMonnit Express 4.0.5.5 (Monnit / iMonnit)",
      "x_gcve": [
        {
          "recordType": "advisory",
          "relationships": [],
          "vulnId": "GCVE-1988-2026-0117",
          "x_vulnarchive": {
            "archiveUrl": "https://vuln.freearchive.org/archive/full-disclosure/2026/Aug/54",
            "automated": true,
            "contentSha256": "62f141d0cd4f591221ed21a7ea4783e9ca3951258d868eace70668e4b363e7aa",
            "evidenceScore": 9,
            "messageId": "",
            "originalUrl": "https://seclists.org/fulldisclosure/2026/Aug/54",
            "policy": "vulnarchive-1",
            "sourceFormat": "text/html",
            "sourcePublishedAt": "2026-08-18T06:03:13Z"
          }
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "4e2abfbf-4a2a-4b76-a4e0-d77c18ba156c",
    "assignerShortName": "VULNARCHIVE",
    "datePublished": "2026-09-07T13:20:22Z",
    "dateUpdated": "2026-09-11T11:50:54Z",
    "state": "PUBLISHED",
    "vulnId": "GCVE-1988-2026-0117"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}