Calendar vulnerabilities
Plugin slug calendar · 6 known vulnerabilities · latest disclosed 2026-07-06 · WordPress.org page
Every listed vulnerability has a fix. Version 1.3.18 or later is not affected by any of them. If your site runs an older version, update it.
2 of 6 rated high or critical (CVSS 7 or more).
Known vulnerabilities in Calendar
| Severity | Affected versions | Fixed in | CVE | Published | Details |
|---|---|---|---|---|---|
| Medium 6.4 | <= 1.3.17 | 1.3.18 | CVE-2026-14827 | 2026-07-06 | Advisory |
| Medium 6.4 | <= 1.3.16 | 1.3.17 | CVE-2025-14548 | 2025-12-22 | Advisory |
| High 8.8 | <= 1.3.14 | 1.3.15 | CVE-2024-2831 | 2024-04-29 | Advisory |
| Medium 5.4 | < 1.3.11 | 1.3.11 | CVE-2018-18872 | 2018-10-30 | Advisory |
| High 7.1 | < 1.3.8 | 1.3.8 | none | 2016-11-08 | Advisory |
| Medium 4.3 | <= 1.3.2 | 1.3.3 | CVE-2013-2698 | 2014-08-01 | Advisory |
Check if a site is affected
Enter a site address to see which version of Calendar and other plugins it runs, and whether they match a known vulnerability.
Questions
Is the Calendar plugin safe to use?
All 6 known issues are fixed in current versions (1.3.18 or later). Keeping it updated is what matters.
How do I check which version of Calendar my site runs?
In WordPress go to Plugins > Installed Plugins. From the outside, the free PluginPeek scan below reads the version from the site's public files.
How do I fix a vulnerable plugin?
Make a full backup, then update it from Dashboard > Updates and check the site afterwards. If you would rather not, we can do it for a fixed $99, paid after you have checked the site.