CVE-2026-14213 Overview
CVE-2026-14213 is a broken access control vulnerability in the Booking for Appointments and Events Calendar WordPress plugin in versions before 2.4.6. The plugin fails to verify that an authenticated employee (provider) is assigned to the appointment being accessed. Any authenticated employee can read any appointment by supplying its identifier, exposing booked customers' personal data. The flaw enables horizontal privilege escalation across provider accounts and results in customer information disclosure.
Critical Impact
Authenticated employees can enumerate appointment identifiers to disclose personal data of customers booked with any other provider on the site.
Affected Products
- Booking for Appointments and Events Calendar WordPress plugin versions before 2.4.6
- WordPress sites running the vulnerable plugin with multiple employee (provider) accounts
- Any site relying on the plugin to segregate appointment data between providers
Discovery Timeline
- 2026-08-13 - CVE-2026-14213 published to the National Vulnerability Database (NVD)
- 2026-08-13 - Last updated in NVD database
Technical Details for CVE-2026-14213
Vulnerability Analysis
The plugin exposes an appointment retrieval endpoint that authenticates the requester as an employee but does not confirm that the requester owns the appointment. The authorization check stops at role verification. It never compares the appointment's assigned provider identifier against the current user identifier. Any authenticated provider can therefore pass an arbitrary appointment identifier and receive the record.
The returned appointment data includes personal information for the booked customer. This constitutes an Insecure Direct Object Reference (IDOR) pattern and maps to [CWE-639] Authorization Bypass Through User-Controlled Key. The vulnerability requires authentication as an employee (provider) but does not require administrator privileges. Additional technical detail is available in the WPScan Vulnerability Report.
Root Cause
The root cause is a missing ownership check in the appointment access handler. The plugin verifies the caller has the provider role but omits the comparison between the appointment's provider assignment and the caller's user identifier. Access control is enforced at the role level rather than the object level.
Attack Vector
An attacker with a valid employee account submits requests referencing appointment identifiers that belong to other providers. Because identifiers are sequential integers, the attacker can iterate through the identifier range to enumerate every appointment stored by the plugin. Each response discloses customer personal data associated with the appointment.
No exploitation code is published in the referenced advisory. See the WPScan Vulnerability Report for coordinated disclosure details.
Detection Methods for CVE-2026-14213
Indicators of Compromise
- Employee accounts issuing sequential requests against the plugin's appointment endpoint with incrementing identifier parameters
- Web server logs showing a single authenticated user retrieving appointment records assigned to multiple different providers
- Unusual spikes in plugin API calls from a single session outside normal booking activity windows
Detection Strategies
- Correlate WordPress user session identifiers with the provider identifier stored on each retrieved appointment record and alert on mismatches
- Rate-limit and log every call to the plugin's appointment retrieval endpoint, then flag accounts that request records exceeding a baseline count per hour
- Review database query logs for appointment SELECT statements initiated by non-administrator user contexts across unrelated provider identifiers
Monitoring Recommendations
- Enable WordPress audit logging for authenticated REST and AJAX calls invoked by employee-role accounts
- Forward web server access logs to a centralized analytics pipeline and build queries that detect enumeration patterns against plugin endpoints
- Monitor for creation of new employee accounts followed by high-volume access to appointment records
How to Mitigate CVE-2026-14213
Immediate Actions Required
- Upgrade the Booking for Appointments and Events Calendar plugin to version 2.4.6 or later on every affected WordPress site
- Audit employee-role accounts for unexpected access patterns against appointment endpoints prior to the upgrade
- Rotate credentials for employee accounts that show suspicious enumeration activity in historical logs
Patch Information
The vendor addressed the missing ownership check in version 2.4.6 of the plugin. Site administrators should apply the update through the WordPress plugin management interface or by deploying the updated plugin package. Reference the WPScan Vulnerability Report for advisory details.
Workarounds
- Temporarily restrict the employee role to trusted personnel only until the plugin is upgraded
- Deploy a web application firewall rule that blocks employee-role sessions from requesting appointment identifiers outside a known allowlist
- Disable the plugin on production sites that cannot be patched immediately and export existing appointment data through the administrator account
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
