CVE-2025-5940: Osompress Osom Blocks

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

The Osom Blocks – Custom Post Type listing block plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘class_name’ parameter in all versions up to, and including, 1.2.1 due to insufficient input sanitization and output escaping. 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

• Osompress Osom Blocks: before 1.2.2 (fixed in 1.2.2)

Published 2025-06-27. Last modified 2026-06-17.