Description
WordPress is prone to a prototype pollution vulnerability. Exploiting this issue could allow an attacker to inject key/value �properties� into JavaScript objects, potentially allowing for execution of arbitrary JavaScript in a user�s session if they can trick that user into clicking a link. WordPress versions 4.8.x ranging from 4.8 and up to (and including) 4.8.18 are vulnerable.
Remediation
Update to WordPress version 4.8.19 or latest
References
https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/jquery-query-object.md
https://wordpress.org/support/wordpress-version/version-4.8.19/
Related Vulnerabilities
Internet Information Services Integer Overflow or Wraparound Vulnerability (CVE-2008-1446)
Internet Information Services Other Vulnerability (CVE-1999-0191)
WordPress Plugin Poll, Survey, Questionnaire and Voting system SQL Injection (1.2.4)
Oracle Database Server CVE-2010-0071 Vulnerability (CVE-2010-0071)
Next.js Deserialization of Untrusted Data Vulnerability (CVE-2025-55182)