Known vulnerabilities in Calendar

A simple but effective Calendar plugin for WordPress that allows you to manage your events and appointments and display them to the world.

6Reported vulnerabilities

8.8Highest CVSS score

1.3.18Latest version

4,000+Active installs

What to do now

Update Calendar to 1.3.18 or later. 6 of these have a fixed version available. Updating resolves them.

Plugin last updated: May 16, 2026 / Tested up to WordPress: 6.9.7 / 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-2018-18872	Medium 5.4	0.7%	Before 1.3.11	`1.3.11`	May 13, 2019
CVE-2024-2831	High 8.8	0.6%	0 to 1.3.14 (inclusive)	`1.3.15`	May 2, 2024
WF-ff22c969-e580-4290-ab08-7c02b6eac938	High 7.1	—	Before 1.3.8	`1.3.8`	November 8, 2016
CVE-2013-2698	Medium 6.8	1.1%	1.3.2 and earlier	`1.3.3`	May 27, 2014
CVE-2026-14827	Medium 6.4	0.2%	1.3.17 and earlier	`1.3.18`	July 6, 2026
CVE-2025-14548	Medium 6.4	0.2%	0 to 1.3.16 (inclusive)	`1.3.17`	December 23, 2025

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