CVE-2025-52731: Eventin Pro Auth Bypass Vulnerability

CVE-2025-52731 Overview

CVE-2025-52731 is a missing authorization vulnerability [CWE-862] in the themefunction Eventin Pro plugin for WordPress. The flaw affects the WordPress Event Manager, Event Calendar and Booking Plugin (eventin-pro) in versions up to and including 4.0.24. The plugin fails to enforce proper access control checks, allowing unauthenticated attackers to perform arbitrary content deletion over the network. Exploitation requires no privileges and no user interaction, making the plugin's event data exposed to remote tampering. Site administrators using vulnerable releases face integrity risks against published events, bookings, and related content stored by the plugin.

Critical Impact

Unauthenticated remote attackers can delete arbitrary content managed by the Eventin Pro plugin, disrupting event operations and booking workflows.

Affected Products

• themefunction WordPress Event Manager, Event Calendar and Booking Plugin (eventin-pro)
• Versions from n/a through <= 4.0.24
• WordPress sites running the Eventin Pro plugin

Discovery Timeline

• 2025-08-14 - CVE-2025-52731 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-52731

Vulnerability Analysis

The vulnerability stems from incorrectly configured access control on one or more plugin endpoints. The Eventin Pro plugin exposes functionality that performs deletion operations without verifying the requester's capability or role. Attackers reach the affected endpoint over the network and trigger destructive actions against plugin-managed content. The impact targets data integrity rather than confidentiality or availability of the underlying host. Successful exploitation removes events, bookings, or related records that the plugin stores within the WordPress database.

Root Cause

The root cause is a missing authorization check [CWE-862] in the request handler responsible for content deletion. The plugin accepts the deletion request and processes it without calling a current_user_can() capability check or validating a nonce tied to a privileged role. This design flaw treats access to the endpoint as proof of authorization, which violates the principle of least privilege.

Attack Vector

The attack vector is network-based and requires no authentication. An attacker issues a crafted HTTP request to the vulnerable plugin endpoint on a WordPress site running eventin-pro<= 4.0.24. Because no privileges or user interaction are required, the request can originate from anywhere on the internet that can reach the target site. Refer to the Patchstack Event Manager Plugin Vulnerability advisory for vendor-coordinated technical details.

Detection Methods for CVE-2025-52731

Indicators of Compromise

• Unexpected deletion of events, bookings, or attendee records from the Eventin Pro plugin tables
• Web server access logs showing unauthenticated POST or DELETE requests to eventin or eventin-pro REST or AJAX endpoints
• Spikes in 200-status responses to plugin endpoints from previously unseen IP addresses

Detection Strategies

• Inventory all WordPress installations and identify those running eventin-pro at or below version 4.0.24
• Monitor WordPress audit logs for content deletion events not tied to an authenticated administrator session
• Compare database snapshots of plugin tables against known-good baselines to identify unauthorized record removal

Monitoring Recommendations

• Enable verbose access logging on the web server for /wp-json/eventin* and /wp-admin/admin-ajax.php requests
• Alert on HTTP requests to plugin endpoints that lack a valid authenticated session cookie
• Track plugin version inventory across managed sites and flag any host pinned to a vulnerable release

How to Mitigate CVE-2025-52731

Immediate Actions Required

• Update the Eventin Pro plugin to a version newer than 4.0.24 as soon as the vendor patch is available
• Take a full backup of the WordPress database and wp-content directory before applying changes
• Audit existing event and booking records for unauthorized deletions and restore from backup where needed

Patch Information

The vendor advisory tracked by Patchstack identifies the issue as an arbitrary content deletion vulnerability affecting eventin-pro through version 4.0.24. Administrators should consult the Patchstack Event Manager Plugin Vulnerability entry and the themefunction vendor channels for the fixed release version and apply it across all WordPress sites.

Workarounds

• Temporarily deactivate the Eventin Pro plugin until a patched version is installed
• Restrict access to plugin REST and AJAX endpoints at the web application firewall layer
• Block unauthenticated requests to eventin-pro deletion endpoints using server-level rules

# Example WAF rule (ModSecurity) to block unauthenticated access to plugin endpoints
SecRule REQUEST_URI "@rx /wp-json/eventin" \
    "id:1052731,phase:1,deny,status:403,\
     chain,msg:'Block unauthenticated Eventin Pro endpoint access (CVE-2025-52731)'"
    SecRule &REQUEST_COOKIES:wordpress_logged_in_* "@eq 0"