Deserialization in Concretecms Concrete Cms
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.
Vulnerability class: Insecure Deserialization
EPSS: 0.037 (88.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Concretecms Concrete_cms
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (Permissions Required, Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (mailing-list, Exploit, x_refsource_FULLDISC, Mailing List, Third Party Advisory)
- cve@mitre.org (Exploit, VDB Entry, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-36766?
- CVE-2021-36766 is a high-severity vulnerability in Concretecms Concrete Cms, classified under Deserialization of Untrusted Data. CVSS score: 7.2/10. Published 2021-07-30.
- How severe is CVE-2021-36766?
- High severity. CVSS v3 base score is 7.2 out of 10.