Description
WordPress is prone to multiple vulnerabilities, including deserialization and PHP file upload vulnerabilities. Exploiting these issues could allow an attacker to call arbitrary PHP Objects that can be used to perform a variety of malicious actions, granted a POP chain is also present or to upload arbitrary code and run it in the context of the webserver process, which may facilitate unauthorized access or privilege escalation. WordPress versions 5.3.x ranging from 5.3 and up to (and including) 5.3.16 are vulnerable.
Remediation
Update to WordPress version 5.3.17 or latest
References
Related Vulnerabilities
TYPO3 Improper Neutralization of HTTP Headers for Scripting Syntax Vulnerability (CVE-2021-41114)
WordPress Plugin WordPress Calls to Action Unspecified Vulnerability (2.3.5)
WordPress Plugin WordPress Backup and Migrate-Backup Guard Arbitrary File Upload (1.0.2)
WordPress Plugin White Label CMS Cross-Site Scripting (1.5.2)
WordPress Plugin Crayon Syntax Highlighter Local File Disclosure (2.6.10)