CVE-2025-32219: eaSYNC Booking Authorization Bypass Flaw

CVE-2025-32219 Overview

CVE-2025-32219 is a Missing Authorization vulnerability [CWE-862] in the Syntactics, Inc. eaSYNC easync-booking plugin for WordPress. The flaw affects all versions up to and including 1.3.19. Authenticated users with low privileges can invoke plugin functionality that should be restricted, because access control checks are misconfigured or absent. Successful exploitation leads to limited impact on integrity and availability of the affected WordPress site.

Critical Impact
Authenticated attackers with low-level privileges can access booking plugin functions that should be restricted, altering or disrupting data managed by the eaSYNC booking system.

Affected Products

Syntactics, Inc. eaSYNC easync-booking WordPress plugin
All versions from initial release through 1.3.19
WordPress sites running the vulnerable plugin with untrusted authenticated users

Discovery Timeline

2025-04-04 - CVE-2025-32219 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-32219

Vulnerability Analysis

The eaSYNC easync-booking plugin exposes actions that lack proper authorization checks. WordPress plugins commonly register handlers through admin-post.php, admin-ajax.php, or the REST API. When these handlers omit current_user_can() capability checks, any authenticated user, including subscriber-level accounts, can invoke privileged operations.

The vulnerability falls under CWE-862: Missing Authorization. The plugin trusts session authentication as sufficient evidence of authorization, without verifying that the calling user holds the roles or capabilities required for the requested action. This is a broken access control class flaw rather than an authentication bypass.

Exploitation impact is limited to what the exposed handlers can modify within the booking system. Reported effects include modification of booking-related data and disruption of plugin availability. Confidentiality is not directly impacted based on the scored vector.

Root Cause

The root cause is the absence of role or capability verification in one or more plugin action handlers. In WordPress, authorization must be enforced explicitly using current_user_can() alongside nonce verification via check_admin_referer() or wp_verify_nonce(). The easync-booking plugin fails to enforce this check at the security boundary between low-privileged authenticated users and administrative plugin functions.

Attack Vector

The attack requires network access to the WordPress site and a valid authenticated account with low privileges. An attacker sends a crafted HTTP request to the vulnerable plugin endpoint. Because the handler does not validate the user role, the server executes the requested action.

No user interaction is required beyond the attacker's own request. Attackers commonly obtain low-privilege accounts through open registration on WordPress sites or by compromising existing subscriber credentials. Refer to the Patchstack Vulnerability Report for endpoint-level details.

Detection Methods for CVE-2025-32219

Indicators of Compromise

Unexpected changes to booking records, reservation entries, or plugin configuration created by non-administrator accounts.
HTTP POST requests to easync-booking plugin endpoints originating from subscriber or contributor accounts.
New or modified bookings created outside of normal customer-facing workflows.
Repeated admin-ajax.php or admin-post.php requests referencing eaSYNC actions from a single low-privilege session.

Detection Strategies

Enable WordPress audit logging to record all authenticated actions against plugin endpoints and correlate user role with action taken.
Inspect web server access logs for requests to /wp-admin/admin-ajax.php or /wp-admin/admin-post.php with action parameters tied to the eaSYNC plugin.
Compare active plugin version against 1.3.19 on every WordPress instance in the estate to identify vulnerable installations.

Monitoring Recommendations

Alert on privilege-sensitive plugin actions performed by users below the editor role.
Monitor for spikes in admin-ajax.php traffic from newly registered accounts.
Track booking record creation and modification rates for anomalies against baseline.

How to Mitigate CVE-2025-32219

Immediate Actions Required

Update the eaSYNC easync-booking plugin to a version later than 1.3.19 as soon as the vendor publishes a fixed release.
Disable open user registration on WordPress sites running the vulnerable plugin until patched.
Audit existing user accounts and remove unused or unrecognized subscriber-level accounts.
Review booking data for unauthorized modifications made prior to remediation.

Patch Information

At the time of NVD publication, the advisory identifies affected versions as n/a through <= 1.3.19. Administrators should consult the Patchstack Vulnerability Report and the vendor plugin page for the fixed release version.

Workarounds

Deactivate the easync-booking plugin until an updated version is installed if the site does not depend on it operationally.
Restrict access to /wp-admin/admin-ajax.php and /wp-admin/admin-post.php for the affected plugin actions using a web application firewall rule.
Enforce strong password policies and multi-factor authentication for all WordPress accounts to reduce the risk of low-privilege account compromise.

bash

# Example WAF rule concept: block eaSYNC plugin actions from non-admin sessions
# Consult your WAF vendor documentation for exact syntax
SecRule REQUEST_URI "@rx /wp-admin/admin-ajax\.php" \
  "chain,deny,status:403,id:1003219,msg:'Block eaSYNC action for low-priv users'"
  SecRule ARGS:action "@rx (?i)easync" "chain"
    SecRule REQUEST_HEADERS:Cookie "!@rx wordpress_logged_in_admin"