Is CVE-2026-18488 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-18488?

CVE-2026-18488 has a CVSS v3 severity of MEDIUM (6.4).

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CVE-2026-18488

Description

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.