CVE-2025-3581: Thenewsletterplugin Newsletter

Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days.

The Newsletter WordPress plugin before 8.8.5 does not validate and escape some of its Widget options before outputting them back in a page/post where the block is embed, 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 2025-06-09. Last modified 2026-06-17.