{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "8.5.6"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "f9c8e08d3651a250f42e0c0a8cc18bc64b42733f"
            }
          ],
          "repo": "https://github.com/concretecms/concretecms",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "Concrete5 through 8.5.5 deserializes Untrusted Data. The vulnerable code is located within the controllers/single_page/dashboard/system/environment/logging.php Logging::update_logging() method. User input passed through the logFile request parameter is not properly sanitized before being used in a call to the file_exists() PHP function. This can be exploited by malicious users to inject arbitrary PHP objects into the application scope (PHP Object Injection via phar:// stream wrapper), allowing them to carry out a variety of attacks, such as executing arbitrary PHP code.",
  "id": "CVE-2021-36766",
  "modified": "2026-04-01T23:08:35.998404514Z",
  "published": "2021-07-30T14:15:18.283Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://hackerone.com/reports/1063039"
    },
    {
      "type": "EVIDENCE",
      "url": "http://seclists.org/fulldisclosure/2021/Jul/36"
    },
    {
      "type": "EVIDENCE",
      "url": "http://packetstormsecurity.com/files/163564/Concrete5-8.5.5-Phar-Deserialization.html"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}