CVE-2026-18488: Creativethemeshq Blocksy Companion

Medium severity, CVSS 6.4. EPSS: 0.3% chance of exploitation in the next 30 days.

The Blocksy Companion plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'tagName' Block Attribute (blocksy/dynamic-data) in all versions up to, and including, 2.1.51 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

• Creativethemeshq Blocksy Companion: up to and including 2.1.51

Published 2026-09-01. Last modified 2026-09-01.