Vulnerability · Published Feb 14, 2026 · Assigned by Wordfence
CVE-2026-1987Scheduler Widget <= 0.1.6 - Insecure Direct Object Reference to Authenticated (Subscriber+) Arbitrary Event Modification
Medium 5.4
In plain English
A medium-severity authorization bypass via user-controlled key in Scheduler Widget from morelmathieuj. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| morelmathieuj | Scheduler Widget | 0 – through 0.1.6 |
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/fd5f370c-743f-41f1-80ab-7f0805cae38c?source=cve
- https://plugins.trac.wordpress.org/browser/scheduler-widget/trunk/scheduler-widget.php#L158
- https://plugins.trac.wordpress.org/browser/scheduler-widget/tags/0.1.6/scheduler-widget.php#L158
- https://owasp.org/www-project-web-security-testing-guide/latest/4-Web_Application_Security_Testing/05-Authorization_Testing/04-Testing_for_Insecure_Direct_Object_References
- https://cwe.mitre.org/data/definitions/639.html
- https://cwe.mitre.org/data/definitions/862.html