WordPress security changelog
MEDIUM CVE-2026-1704 Deferred

Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin: A security weakness

Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin is affected by a security weakness. Exploitation requires an authenticated WordPress account. The resulting impact depends on how the affected component exposes the vulnerable operation.

CVE / CNA score 4.3 CVSS 3.1 · security@wordfence.com
NVD score Pending NVD has not published its own CVSS assessment.
Component
Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin
Plugin slug
simply-schedule-appointments
Affected
See vendor advisory
Safe version
See mitigation notes
Published
Mar 13, 2026
Weakness
CWE-639 — Authorization Bypass Through User-Controlled Key

This CVE was published Mar 13, 2026 and is one of 31 known issues for this plugin.

What to do

Update, patch or deactivate.

Update Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin to a release outside the affected range, or disable and remove it until a fixed version is available.

No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical description

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 1.6.9.29. This is due to the `get_item_permissions_check` method granting access to users with the `ssa_manage_appointments` capability without validating staff ownership of the requested appointment. This makes it possible for authenticated attackers, with custom-level access and above (users granted the ssa_manage_appointments capability, such as Team Members), to view appointment records belonging to other staff members and access sensitive customer personally identifiable information via the appointment ID parameter.

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

Primary and upstream sources