CVE-2026-78159

Vulnerability Description

The The Events Calendar plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 6.17.3 via the parse_array function. This is due to insufficient validation of the widget 'classes' map, allowing a plain-array payload to bypass the is_safe_widget_instance() object check and reach the callable-invocation sink in Element_Classes::parse_array(). This makes it possible for unauthenticated attackers to execute code on the server. Exploitation requires that the targeted site has comments enabled on tribe_events posts and that at least one comment containing a crafted wp:legacy-widget block has been submitted, as the attack chain is triggered when do_blocks() processes the single-event HTML including the comment area.

CVSS Score

Related Weaknesses (CWE)

References

• https://plugins.trac.wordpress.org/browser/the-events-calendar/tags/6.17.3/commo
• https://plugins.trac.wordpress.org/browser/the-events-calendar/tags/6.17.3/src/T
• https://plugins.trac.wordpress.org/browser/the-events-calendar/tags/6.17.3/src/T
• https://plugins.trac.wordpress.org/browser/the-events-calendar/tags/6.17.3/src/v
• https://plugins.trac.wordpress.org/changeset?reponame=&old=3667866%40the-events-
• https://plugins.trac.wordpress.org/changeset?reponame=&old=3667867%40the-events-
• https://www.wordfence.com/threat-intel/vulnerabilities/id/cc2ccfeb-6df6-4fee-96a