CVE-2023-40556: Toolstack Schedule Posts Calendar

High severity, CVSS 8.8. EPSS: 0.3% chance of exploitation in the next 30 days.

Cross-Site Request Forgery (CSRF) vulnerability in Greg Ross Schedule Posts Calendar plugin <= 5.2 versions.

Affected products

• Toolstack Schedule Posts Calendar: up to and including 5.2

Published 2023-10-06. Last modified 2026-06-17.