CVE-2021-24604: Offshorewebmaster Availability Calendar

Medium severity, CVSS 4.8. EPSS: 0.6% chance of exploitation in the next 30 days.

The Availability Calendar WordPress plugin before 1.2.2 does not sanitise or escape its Category Names before outputting them in page/post where the associated shortcode is embed, allowing high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html is disallowed

Affected products

• Offshorewebmaster Availability Calendar: before 1.2.2 (fixed in 1.2.2)

Published 2021-09-20. Last modified 2026-06-17.