CVE-2021-36766

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.

• CWE-502

• http://packetstormsecurity.com/files/163564/Concrete5-8.5.5-Phar-Deserialization.htmlExploit, Third Party Advisory, VDB Entry
• http://seclists.org/fulldisclosure/2021/Jul/36Exploit, Mailing List, Third Party Advisory
• https://hackerone.com/reports/1063039Permissions Required, Third Party Advisory
• http://packetstormsecurity.com/files/163564/Concrete5-8.5.5-Phar-Deserialization.htmlExploit, Third Party Advisory, VDB Entry
• http://seclists.org/fulldisclosure/2021/Jul/36Exploit, Mailing List, Third Party Advisory
• https://hackerone.com/reports/1063039Permissions Required, Third Party Advisory

Published

Jul 30, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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