CVE-2021-36766

    Dashboard / Vulnerabilities / CVE-2021-36766

    CVE-2021-36766

    Published: 30 Jul 2021Last Modified: 9 Jul 2026

    Summary:

    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.

    References: https://hackerone.com/reports/1063039, http://packetstormsecurity.com/files/163564/Concrete5-8.5.5-Phar-Deserialization.html, http://seclists.org/fulldisclosure/2021/Jul/36

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -f9c8e08d3651a250f42e0c0a8cc18bc64b42733f

    Affected versions

    8.4.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-36766 | CVE-DB