CVE-2025-3584: Thenewsletterplugin Newsletter

Medium severity, CVSS 4.8. EPSS: 0.2% chance of exploitation in the next 30 days.

The Newsletter WordPress plugin before 8.8.2 does not sanitise and escape some of its Subscription settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).

Affected products

Published 2025-06-03. Last modified 2026-06-17.