CVE-2026-6378mediumCWE-79

CVE-2026-6378: medium-severity vulnerability in ckp267 MaxiBlocks Builder | 17,000+ Design…

Maxi Blocks <= 2.1.9 - Authenticated (Author+) Stored Cross-Site Scripting via Style Card REST API

Published 02 May 2026 · Updated 04 May 2026

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.4epss 0.2%

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Affected products

ckp267 · MaxiBlocks Builder | 17,000+ Design Assets, Patterns, Icons & Starter Sites

Related CVEs — ckp267 MaxiBlocks Builder | 17,000+ Design…

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CVE-2024-6885HIGHMaxiBlocks: 2200+ Patterns, 190 Pages, 14.2K Icons & 100 Styles <= 1.9.2 - Authenticated (Subscriber+) Arbitrary File DeletionEPSS 1.1%CVE-2026-2028MEDIUMMaxi Blocks <= 2.1.8 - Missing Authorization to Authenticated (Author+) Media File Deletion via 'old_media_src' ParameterEPSS 0.3%

References