CVE-2026-5820: Sproutient Zypento Blocks

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

The Zypento Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Table of Contents block in all versions up to, and including, 1.0.6. This is due to the front-end TOC rendering script reading heading text via `innerText` and inserting it into the page using `innerHTML` without proper sanitization. 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

• Sproutient Zypento Blocks: up to and including 1.06

Published 2026-04-22. Last modified 2026-06-17.