The Maxi Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `/wp-json/maxi-blocks/v1.0/style-card` REST API endpoint in all versions up to, and including, 2.1.9 due to insufficient input sanitization and output escaping of the `sc_styles` parameter. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts that execute on every page where the plugin's style card styles are loaded, including across the entire WordPress admin panel.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Maxi Blocks Plugin | — | Update maxi-blocks plugin to version 2.1.10, or a newer patched version | May 4, 2026 | May 1, 2026 |
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