CVE-2021-39343: Mpl-Publisher

Medium severity, CVSS 4.8. EPSS: 1% chance of exploitation in the next 30 days.

The MPL-Publisher WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and sanitization via several parameters found in the ~/libs/PublisherController.php file which allowed attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 1.30.2. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled.

Affected products

• Mpl-Publisher Mpl-Publisher: up to and including 1.30.2

Published 2021-10-19. Last modified 2026-06-17.