CVE-2026-84740: Unknown The Events Calendar

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

The Events Calendar WordPress plugin before 6.17.5.1 does not validate or sanitise data submitted to an unauthenticated AJAX action before merging it into its rendering context, allowing unauthenticated users to execute arbitrary shortcodes registered on the site.

Affected products

• Unknown The Events Calendar: from 6.12.0, before 6.17.5.1 (fixed in 6.17.5.1)

Published 2026-10-02. Last modified 2026-10-02.