CVE-2025-8567: Posimyththemes Nexter Blocks – Gutenberg Blocks, Page Builder & Ai Website Builder

Medium severity, CVSS 6.4. EPSS: 0.2% chance of exploitation in the next 30 days.

The Nexter Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via multiple widgets in all versions up to, and including, 4.5.4 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

• Posimyththemes Nexter Blocks – Gutenberg Blocks, Page Builder & Ai Website Builder: up to and including 4.5.4

Published 2025-08-19. Last modified 2026-06-17.