Description
WordPress is prone to a vulnerability that lets remote attackers inject and execute arbitrary code because the application fails to sanitize user-supplied input before being passed to the unserialize() PHP function. Attackers can possibly exploit this issue to execute arbitrary PHP code within the context of the affected webserver process. WordPress versions 4.9.x ranging from 4.9 and up to (and including) 4.9.17 are vulnerable.
Remediation
Update to WordPress version 4.9.18 or latest
References
https://github.com/JamesGeee/CVE-2020-36326
https://wordpress.org/support/wordpress-version/version-4-9-18/
Related Vulnerabilities
Oracle HTTP Server CVE-2021-35666 Vulnerability (CVE-2021-35666)
Atlassian Jira CVE-2021-39121 Vulnerability (CVE-2021-39121)
ownCloud Cross-Site Request Forgery (CSRF) Vulnerability (CVE-2020-28644)
WordPress Plugin Another WordPress Classifieds Arbitrary File Upload (3.3.2)
WordPress Plugin Timeline Event History PHP Object Injection (3.1)