CVE-2025-5919: WP Timetics Auth Bypass Vulnerability

CVE-2025-5919 Overview

The Appointment Booking and Scheduling Calendar Plugin – WP Timetics for WordPress contains a missing authorization vulnerability that allows unauthorized access and modification of data. The vulnerability exists due to a missing capability check on the update and register_routes functions in all versions up to, and including, version 1.0.36. This security flaw enables unauthenticated attackers to view and modify booking details without proper authorization.

Critical Impact

Unauthenticated attackers can access and manipulate booking information, potentially compromising customer data and disrupting business operations for WordPress sites using this appointment scheduling plugin.

Affected Products

• WP Timetics Plugin version 1.0.36 and earlier
• WordPress installations with WP Timetics installed
• Any site using the Appointment Booking and Scheduling Calendar Plugin – WP Timetics

Discovery Timeline

• 2026-01-06 - CVE CVE-2025-5919 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-5919

Vulnerability Analysis

This vulnerability falls under CWE-862 (Missing Authorization), a common security weakness where an application fails to perform proper authorization checks before granting access to restricted functionality. In the case of WP Timetics, the update and register_routes functions lack the necessary capability checks that would typically verify whether the requesting user has appropriate permissions to perform booking-related operations.

The exposed API endpoints allow any unauthenticated user to interact with the booking system's backend functionality. This includes the ability to read booking details that may contain sensitive customer information such as names, contact details, appointment times, and potentially payment information. Additionally, attackers can modify existing bookings, which could lead to denial of service for legitimate customers or manipulation of business records.

Root Cause

The root cause of this vulnerability is the absence of proper WordPress capability checks in critical API functions. WordPress provides a robust permission system through capabilities and roles, but the WP Timetics plugin failed to implement these checks on the update function located in booking.php and the register_routes function in api-booking.php. Without calling functions like current_user_can() before executing sensitive operations, the plugin permits any HTTP request to access protected functionality regardless of authentication status.

Attack Vector

The attack vector is network-based, requiring no authentication and no user interaction. An attacker can exploit this vulnerability by sending crafted HTTP requests directly to the vulnerable API endpoints exposed by the WP Timetics plugin. The attack complexity is low since the attacker only needs to identify WordPress installations with the vulnerable plugin and send appropriately formatted requests to the booking API.

The vulnerable code paths can be examined in the WordPress Timetics Booking Code and WordPress Timetics API Code. An attacker would typically enumerate available booking IDs and then issue GET requests to retrieve booking details or POST/PUT requests to modify booking data without any authentication headers or credentials.

Detection Methods for CVE-2025-5919

Indicators of Compromise

• Unusual or unexpected API requests to WP Timetics booking endpoints from external IP addresses
• Modified booking records without corresponding authenticated user activity in WordPress logs
• Increased volume of requests to /wp-json/timetics/ or related REST API endpoints
• Database changes to booking tables that lack associated admin panel activity

Detection Strategies

• Monitor WordPress REST API logs for unauthenticated requests to timetics booking endpoints
• Implement web application firewall (WAF) rules to detect and block suspicious booking API activity
• Review WordPress access logs for patterns indicating enumeration of booking IDs
• Deploy SentinelOne Singularity XDR to detect anomalous web application behavior and unauthorized data access patterns

Monitoring Recommendations

• Enable detailed logging for all WordPress REST API requests
• Set up alerts for bulk API requests to booking-related endpoints
• Monitor for changes to booking data outside of normal business hours
• Regularly audit booking records for unauthorized modifications

How to Mitigate CVE-2025-5919

Immediate Actions Required

• Update WP Timetics plugin to a version newer than 1.0.36 that includes proper authorization checks
• If unable to update immediately, disable the WP Timetics plugin until a patched version is available
• Review booking records for signs of unauthorized access or modification
• Implement WAF rules to restrict access to the plugin's API endpoints to authenticated users only

Patch Information

Organizations should check the WordPress plugin repository for updated versions of WP Timetics that address this vulnerability. The Wordfence Vulnerability Analysis provides additional details on affected versions and remediation guidance. Ensure that automatic plugin updates are enabled or regularly check for security updates to prevent exposure to known vulnerabilities.

Workarounds

• Restrict access to WordPress REST API endpoints using .htaccess rules or server-level configurations
• Implement IP whitelisting for admin-only API access at the web server level
• Deploy a web application firewall with rules specifically targeting unauthorized booking API access
• Consider temporarily using alternative booking solutions until the plugin is patched

# Example .htaccess rule to restrict timetics API access
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/wp-json/timetics/ [NC]
RewriteCond %{REMOTE_ADDR} !^192\.168\.1\. [NC]
RewriteRule .* - [F,L]
</IfModule>