{"api_version":"1","generated_at":"2026-07-24T22:38:20+00:00","cve":"CVE-2021-36766","urls":{"html":"https://cve.report/CVE-2021-36766","api":"https://cve.report/api/cve/CVE-2021-36766.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-36766","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-36766"},"summary":{"title":"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.","state":"PUBLIC","assigner":"cve@mitre.org","published_at":"2021-07-30 14:15:00","updated_at":"2021-09-22 16:56:00"},"problem_types":["CWE-502"],"metrics":[],"references":[{"url":"https://hackerone.com/reports/1063039","name":"https://hackerone.com/reports/1063039","refsource":"MISC","tags":[],"title":"HackerOne","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"http://packetstormsecurity.com/files/163564/Concrete5-8.5.5-Phar-Deserialization.html","name":"http://packetstormsecurity.com/files/163564/Concrete5-8.5.5-Phar-Deserialization.html","refsource":"MISC","tags":[],"title":"Concrete5 8.5.5 Phar Deserialization ≈ Packet Storm","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"http://seclists.org/fulldisclosure/2021/Jul/36","name":"20210719 [KIS-2021-05] Concrete5 <= 8.5.5 (Logging Settings) Phar Deserialization Vulnerability","refsource":"FULLDISC","tags":[],"title":"Full Disclosure: [KIS-2021-05] Concrete5 <= 8.5.5 (Logging Settings) Phar Deserialization Vulnerability","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-36766","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-36766","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"36766","vulnerable":"1","versionEndIncluding":"8.5.5","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"concrete5","cpe5":"concrete5","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"-","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"36766","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"concretecms","cpe5":"concrete_cms","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2021-36766","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"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."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"url":"https://hackerone.com/reports/1063039","refsource":"MISC","name":"https://hackerone.com/reports/1063039"},{"refsource":"FULLDISC","name":"20210719 [KIS-2021-05] Concrete5 <= 8.5.5 (Logging Settings) Phar Deserialization Vulnerability","url":"http://seclists.org/fulldisclosure/2021/Jul/36"},{"refsource":"MISC","name":"http://packetstormsecurity.com/files/163564/Concrete5-8.5.5-Phar-Deserialization.html","url":"http://packetstormsecurity.com/files/163564/Concrete5-8.5.5-Phar-Deserialization.html"}]}},"nvd":{"publishedDate":"2021-07-30 14:15:00","lastModifiedDate":"2021-09-22 16:56:00","problem_types":["CWE-502"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":7.2,"baseSeverity":"HIGH"},"exploitabilityScore":1.2,"impactScore":5.9},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:S/C:P/I:P/A:P","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"SINGLE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL","baseScore":6.5},"severity":"MEDIUM","exploitabilityScore":8,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*","versionEndExcluding":"8.5.6","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"36766","Ordinal":"212327","Title":"CVE-2021-36766","CVE":"CVE-2021-36766","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"36766","Ordinal":"1","NoteData":"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.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"36766","Ordinal":"2","NoteData":"2021-07-27","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"36766","Ordinal":"3","NoteData":"2021-07-27","Type":"Other","Title":"Modified"}]}}}