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5.4
WordPress Scheduler Widget Plugin Allows Event Hijacking
CVE-2026-1987
Summary
The Scheduler Widget plugin for WordPress has a security flaw that allows hackers to take control of events. This means that attackers can modify or delete any event, even if they aren't the owner. Update the plugin to the latest version to fix this vulnerability.
Original title
The Scheduler Widget plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 0.1.6. This is due to the `scheduler_widget_ajax_save_event()` func...
Original description
The Scheduler Widget plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 0.1.6. This is due to the `scheduler_widget_ajax_save_event()` function lacking proper authorization checks and ownership verification when updating events. This makes it possible for authenticated attackers, with Subscriber-level access and above, to modify any event in the scheduler via the `id` parameter granted they have knowledge of the event ID.
nvd CVSS3.1
5.4
Vulnerability type
CWE-639
Authorization Bypass Through User-Controlled Key
- https://cwe.mitre.org/data/definitions/639.html
- https://cwe.mitre.org/data/definitions/862.html
- https://owasp.org/www-project-web-security-testing-guide/latest/4-Web_Applicatio...
- https://plugins.trac.wordpress.org/browser/scheduler-widget/tags/0.1.6/scheduler...
- https://plugins.trac.wordpress.org/browser/scheduler-widget/trunk/scheduler-widg...
- https://www.wordfence.com/threat-intel/vulnerabilities/id/fd5f370c-743f-41f1-80a...
Published: 14 Feb 2026 · Updated: 10 Mar 2026 · First seen: 6 Mar 2026