Free tool
Is my WordPress plugin safe?
Type a plugin or theme and the version you run, and we’ll show every known vulnerability that affects it, from the 390,007 records in our vulnerability database. The version is listed under Plugins in your WordPress dashboard.
Plugin · holiday-class-post-calendar
Holiday class post calendar
1 known vulnerability on record. Add your version above to see which ones affect you.
Nov 10, 2025Holiday class post calendar: Remote Code ExecutionCVE-2025-12813 · affects up to 7.1 · reported by WordfenceCritical 9.8
The Holiday class post calendar plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 7.1 via the 'contents' parameter. This is due to a lack of sanitization of user-supplied data when creating a cache file. This makes it possible for unauthenticated attackers to execute code on the server.
NVD recordplugins.trac.wordpress.orgplugins.trac.wordpress.org
Versions are matched against the affected ranges published with each record. A plugin can ship a fix under its own numbering, so if something looks off, check the linked record. Want the whole site checked at once? Run the free website check.
Tell us what you're building.
A website, your marketing, a security check, an app, or the thing you've been running out of a spreadsheet for three years. A few lines is plenty.
Not ready to talk yet? Run the free website check and see what Google sees.