Findings

CVE-2026-104798

The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 3.8.7.

Published Oct 16, 2026 · updated Oct 16, 2026

The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 3.8.7. The public GET parameter is reflected into post content unsanitized before WordPress core's filter runs, allowing an unauthenticated attacker to inject a nested shortcode; then splits the attribute on commas and dispatches each element via with no authentication, authorization, or callable allowlist check. This makes it possible for unauthenticated attackers to invoke arbitrary loaded PHP functions, enabling a call chain in which the shortcode array is passed to — which PHP coerces to integer as the argument — overwriting the credentials of the initial Administrator account (user ID 1) and granting the attacker full wp-admin access. Exploitation is trivially reachable via the plugin's auto-generated page, which is publicly accessible by default upon plugin activation.