Reported vulnerability

Appointment Booking Calendar <= 1.6.9.29 - Insecure Direct Object Reference to Authenticated (Staff+) Sensitive Information Exposure

Q: Which versions of Simply Schedule Appointments are affected?

Wordfence lists these affected versions: Start version unspecified, through 1.6.9.29. Use the version checker above to compare your installed release with this report.

Q: Is a fix available for Simply Schedule Appointments?

Wordfence reports a fix for this issue in Simply Schedule Appointments. It lists these fixed versions: 1.6.10.0. Back up your website and test the recommended update before applying it to your live site.

Q: Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Published 12 Mar 2026

Updated 13 Mar 2026

CVE-2026-1704

Compare your installed software with the affected versions below. Follow the source’s remediation guidance and test an available update after taking a backup. A database entry describes a reported issue; it does not establish whether a particular website has been compromised.

Does this affect my version?

Check your installed version against this advisory. This compares the report’s version ranges and does not scan your website.

Wordfence advisory

medium · CVSS 4.3

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.

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

Simply Schedule Appointments

Software: plugin · simply-schedule-appointments
Affected versions: Start version unspecified, through 1.6.9.29
Fix availability: Fix available
Fixed versions: 1.6.10.0

Recommended action

Update to version 1.6.10.0, or a newer patched version

Further references (1)

wordfence.com/threat-intel/vulnerabilities/id/c82f3864-13af-4ff6-824a-4c799a98f3f6?source=api-prod

Data sources and licences

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CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

Read licence terms

Source: Wordfence

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Questions about this vulnerability

Which versions of Simply Schedule Appointments are affected?

Wordfence lists these affected versions: Start version unspecified, through 1.6.9.29. Use the version checker above to compare your installed release with this report.

Is a fix available for Simply Schedule Appointments?

Wordfence reports a fix for this issue in Simply Schedule Appointments. It lists these fixed versions: 1.6.10.0. Back up your website and test the recommended update before applying it to your live site.

Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Does an affected version mean my website has been hacked?

An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.

These reports cover at least one of the same plugins, themes or WordPress core. Check each report’s affected versions separately.

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