CVE-2023-0340: Custom Content Shortcode Project Custom Content Shortcode

High severity, CVSS 8.8. EPSS: 1% chance of exploitation in the next 30 days.

The Custom Content Shortcode WordPress plugin through 4.0.2 does not validate one of its shortcode attribute, which could allow users with a contributor role and above to include arbitrary files via a traversal attack. This could also allow them to read non PHP files and retrieve their content. RCE could also be achieved if the attacker manage to upload a malicious image containing PHP code, and then include it via the affected attribute, on a default WP install, authors could easily achieve that given that they have the upload_file capability.

Affected products

• Custom Content Shortcode Project Custom Content Shortcode: up to and including 4.0.2

Published 2023-03-20. Last modified 2026-06-17.