{"id":"CVE-2021-36766","aliases":["EUVD-2021-23354","GHSA-492p-w2m4-4h4m"],"status":"published","title":"Concrete5 through 8.5.5 deserializes Untrusted Data. The vulnerable code is located within the...","description":"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.","severity":{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.0368,"percentile":0.89771,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-502"],"published":"2021-07-27T05:38:42Z","modified":"2026-10-24T10:30:20Z","products":[{"vendor":"concretecms","product":"concrete_cms"}],"references":[{"url":"https://hackerone.com/reports/1063039","tags":["x_refsource_MISC","x_transferred","Permissions Required","Third Party Advisory","report"]},{"url":"http://seclists.org/fulldisclosure/2021/Jul/36","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Exploit","Mailing List","Third Party Advisory","evidence"]},{"url":"http://packetstormsecurity.com/files/163564/Concrete5-8.5.5-Phar-Deserialization.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","VDB Entry","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-36766"},{"url":"https://github.com/advisories/GHSA-492p-w2m4-4h4m"}],"sources":{"cve":[{"id":"CVE-2021-36766","description":"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.","status":"published","published":"2021-07-27T05:38:42Z","modified":"2024-08-04T01:01:59.251Z","updated_at":"2026-11-02T14:33:05.989686Z"}],"euvd":[{"id":"EUVD-2021-23354","description":"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.","status":"published","published":"2021-07-27T05:38:42Z","modified":"2024-08-04T01:01:59Z","updated_at":"2026-11-03T03:24:29.329171Z"}],"ghsa":[{"id":"GHSA-492p-w2m4-4h4m","title":"Concrete5 through 8.5.5 deserializes Untrusted Data. The vulnerable code is located within the...","description":"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.","status":"published","published":"2022-05-24T19:09:21Z","modified":"2023-01-30T05:00:59Z","cwes":["CWE-502"],"updated_at":"2026-11-02T14:46:19.140142Z"}],"nvd":[{"id":"CVE-2021-36766","description":"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.","status":"published","published":"2021-07-30T14:15:18.283Z","modified":"2026-06-17T03:59:07.927Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.5,"vector":"AV:N/AC:L/Au:S/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:06:56.185362Z"}],"osv":[{"id":"CVE-2021-36766","description":"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.","status":"published","published":"2021-07-30T14:15:18.283Z","modified":"2026-10-24T10:30:20.803383795Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:20.434873Z"}]}}