CVE-2021-24826: Custom Content Shortcode Project Custom Content Shortcode

Medium severity, CVSS 5.4. EPSS: 0.6% chance of exploitation in the next 30 days.

The Custom Content Shortcode WordPress plugin before 4.0.2 does not escape custom fields before outputting them, which could allow Contributor+ (v < 4.0.1) or Admin+ (v < 4.0.2) users to perform Cross-Site Scripting attacks even when the unfiltered_html is disallowed. Please note that such attack is still possible by admin+ in single site blogs by default (but won't be when the unfiltered_html is disallowed)

Affected products

• Custom Content Shortcode Project Custom Content Shortcode: before 4.0.2 (fixed in 4.0.2)

Published 2022-03-07. Last modified 2026-06-17.