CVE-2021-36766

HighCVSS 7.2/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.2/10CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-502

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

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

Timeline

Published: Jul 30, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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