{
  "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 Stimulsoft Server 2026.3.1 (Stimulsoft). The \nresearch is published and a proof-of-concept is available.\n\nPre-authentication SYSTEM RCE (CVSS 9.8, pre-authentication)\n\nA default-configuration defect chain combines into a complete unauthenticated RCE. The /1/signup endpoint is open by \ndefault with email activation disabled, so an anonymous attacker registers and immediately receives a Supervisor \naccount. The Supervisor uploads a .mrt report template containing an embedded C# script. PUT \n/1/reporttemplates/\u003cid\u003e/run triggers the report-script engine, which compiles the script with CSharpCodeProvider in \nfull trust (no AppDomain isolation, no CAS sandbox, no class allowlist) and instantiates the report class, executing \nthe attacker-controlled constructor. The report task runs in the backend service process Stimulsoft.Server.Agent.exe as \nNT AUTHORITY\\SYSTEM. No credentials, no SMTP, no administrator action, and no non-default configuration are required.\n\nImpact: Full system takeover; the report task executes in the backend service process running as NT AUTHORITY\\SYSTEM, \ngiving arbitrary code execution with the highest Windows privilege.\n\nAdvisory: https://0day-rubbish.com/blog/stimulsoft-server-unauth-report-script-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 \u0026 RSS: https://seclists.org/fulldisclosure/"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-11T11:37:14Z",
        "orgId": "4e2abfbf-4a2a-4b76-a4e0-d77c18ba156c",
        "shortName": "VULNARCHIVE"
      },
      "references": [
        {
          "tags": [
            "technical-description",
            "exploit"
          ],
          "url": "https://vuln.freearchive.org/archive/full-disclosure/2026/Aug/9"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://seclists.org/fulldisclosure/2026/Aug/9"
        },
        {
          "url": "https://0day-rubbish.com"
        },
        {
          "url": "https://0day-rubbish.com/blog/stimulsoft-server-unauth-report-script-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/9"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "Security advisory: Pre-authentication SYSTEM RCE in Stimulsoft Server 2026.3.1 (Stimulsoft)",
      "x_gcve": [
        {
          "recordType": "advisory",
          "relationships": [],
          "vulnId": "GCVE-1988-2026-0056",
          "x_vulnarchive": {
            "archiveUrl": "https://vuln.freearchive.org/archive/full-disclosure/2026/Aug/9",
            "automated": true,
            "contentSha256": "e93aa4f24d03c1931d3cd8b6dd3af1323819c4d983936a8ff51957fff654f1c7",
            "evidenceScore": 9,
            "messageId": "",
            "originalUrl": "https://seclists.org/fulldisclosure/2026/Aug/9",
            "policy": "vulnarchive-1",
            "sourceFormat": "text/html",
            "sourcePublishedAt": "2026-08-03T03:36:18Z"
          }
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "4e2abfbf-4a2a-4b76-a4e0-d77c18ba156c",
    "assignerShortName": "VULNARCHIVE",
    "datePublished": "2026-09-07T13:20:21Z",
    "dateUpdated": "2026-09-11T11:37:14Z",
    "state": "PUBLISHED",
    "vulnId": "GCVE-1988-2026-0056"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}