Description
Apache Commons Configuration uses a third-party library to parse YAML files which by default allows the instantiation of classes if the YAML includes special statements. Apache Commons Configuration versions 2.2, 2.3, 2.4, 2.5, 2.6 did not change the default settings of this library. So if a YAML file was loaded from an untrusted source, it could therefore load and execute code out of the control of the host application.
Remediation
References
Related Vulnerabilities
PHP Out-of-bounds Read Vulnerability (CVE-2020-7061)
WordPress Plugin Captcha by BestWebSoft Multiple Cross-Site Scripting Vulnerabilities (4.1.5)
WordPress Plugin Fancy Comments WordPress Cross-Site Scripting (1.2.10)
WordPress 4.0.x Possible SQL Injection Vulnerability (4.0 - 4.0.19)
ownCloud Permissions, Privileges, and Access Controls Vulnerability (CVE-2014-9048)