Known vulnerabilities in WP FullCalendar

Uses the FullCalendar library to create a stunning calendar view of events, posts and other custom post types

4Reported vulnerabilities

6.4Highest CVSS score

1.6Latest version

8,000+Active installs

What to do now

Update WP FullCalendar to 1.6 or later. 2 of these have a fixed version available. Updating resolves them.

Plugin last updated: May 23, 2026 / Tested up to WordPress: 7.0.4 / View on wordpress.org

Reported vulnerabilities

Ordered by how urgently they need attention — whether a vulnerability is actually being exploited, and how likely exploitation is, rather than CVSS severity alone.

CVE	Severity	Exploit probability next 30 days	Affected versions	Fixed in	Published
CVE-2022-3891	Medium 5.3	0.7%	Before 1.5	`1.5`	February 13, 2023
CVE-2025-22261	Medium 6.4	0.3%	1.5 and earlier	`1.6`	January 6, 2025
CVE-2026-22351	Medium 5.3	0.3%	1.6 and earlier	—	February 11, 2026
CVE-2026-24523	Medium 5.3	0.3%	1.6 and earlier	—	January 26, 2026

Sources: vulnerability records from NVD, exploitation from CISA KEV, exploit probability from EPSS. Affected versions come from CPE ranges or from the reporting CNA.