CVE-2026-6378 Maxi Blocks <= 2.1.9 - Authenticated (Author+) Stored Cross-Site Scripting via Style Card REST API
Authenticated attackers with Author access can inject scripts via the Style Card REST API, executing code in admin panels and user sessions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-6378?
CVE-2026-6378 is a medium-severity cross-site scripting vulnerability in ckp267 MaxiBlocks Builder | 17,000+ Design Assets, Patterns, Icons & Starter Sites, published on 2 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-6378?
How do I fix CVE-2026-6378?
No fix has been published for CVE-2026-6378 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-6378 being exploited?
There is no known exploitation of CVE-2026-6378 in the wild and no public exploit code.
Sources
Also known as GHSA-8p3w-9597-pwh9.