CVE-2026-1704

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

2026-03-12 19:08
Itthidej Aramsri (Boeing777)

Strategic Overview

Status
Patched in 1.6.10.0
Affected Plugin
Simply Schedule Appointments
Affected Version
<= 1.6.9.29
CVSS
4.3Medium
Weakness type
CWE-639 · Authorization Bypass Through User-Controlled Key
CVE
CVE-2026-1704
View all Simply Schedule Appointments vulnerabilities

At a glance

CVE-2026-1704 is a medium-severity Authorization Bypass Through User-Controlled Key vulnerability in the Simply Schedule Appointments WordPress plugin, affecting versions <= 1.6.9.29. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Staff level or above. The issue is fixed in version 1.6.10.0; sites on affected versions should update now. Disclosed March 2026, reported by Itthidej Aramsri (Boeing777).

Vulnerability Overview

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.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.

CWE-639: Authorization Bypass Through User-Controlled Key

Reaching this weakness in Simply Schedule Appointments <= 1.6.9.29 takes an account at Staff level or above. Authorization bypass through a user-controlled key, often called insecure direct object reference, means the application looks up a record by an identifier from the request without checking that the caller owns it.

Changing a number in the request is enough to read or modify other users' records, which on commerce and membership sites means customer data. For Simply Schedule Appointments the fix is 1.6.10.0: builds <= 1.6.9.29 are affected, anything from 1.6.10.0 onward is not.

Remediation

Update to version 1.6.10.0, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Simply Schedule Appointments 1.6.10.0 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-1704https://www.wordfence.com/threat-intel/vulnerabilities/id/c82f3864-13af-4ff6-824a-4c799a98f3f6https://nvd.nist.gov/vuln/detail/CVE-2026-1704

Related records

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