CVE-2026-39433: WPAMS Auth Bypass Vulnerability

CVE-2026-39433 Overview

CVE-2026-39433 is a missing authorization vulnerability [CWE-862] in the WordPress WPAMS (Apartment Management System) plugin in versions prior to 49.5.3. The flaw allows authenticated users with Subscriber-level privileges to delete arbitrary content from the affected WordPress site. Exploitation requires only low-privilege authentication, which Subscriber accounts satisfy by default on sites that permit user registration.

Critical Impact
Authenticated Subscriber users can delete arbitrary content across the WordPress site, resulting in availability loss for posts, pages, and plugin-managed records.

Affected Products

WordPress WPAMS (Apartment Management System) plugin
All versions prior to 49.5.3
WordPress sites permitting Subscriber registration with the plugin installed

Discovery Timeline

2026-06-17 - CVE-2026-39433 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-39433

Vulnerability Analysis

The vulnerability is a broken access control issue in the WPAMS plugin. The affected plugin endpoints handle content deletion operations without verifying that the requesting user holds sufficient privileges. A Subscriber, the lowest authenticated WordPress role, can invoke these endpoints and delete content the user does not own.

This class of flaw maps to [CWE-862] Missing Authorization. The plugin relies on authentication alone, not on capability or ownership checks, before processing destructive actions. Attackers do not require user interaction beyond authenticating with valid Subscriber credentials.

The impact is restricted to integrity-free availability loss as reflected in the CVSS vector. No data disclosure or code execution occurs, but deleted records cannot be recovered without backup restoration.

Root Cause

The plugin's deletion handlers omit calls to WordPress capability checks such as current_user_can() and do not validate object ownership. Requests reach the deletion logic after only a nonce or authentication check, which any Subscriber session satisfies.

Attack Vector

An attacker registers or compromises a Subscriber account on a vulnerable WordPress site. The attacker then issues an HTTP request to the vulnerable WPAMS deletion endpoint, supplying the identifier of the target content. The plugin executes the deletion without verifying the requester's authority over the resource.

The vulnerability mechanism is described in the Patchstack Vulnerability Report. No public proof-of-concept exploit is available at this time.

Detection Methods for CVE-2026-39433

Indicators of Compromise

Unexpected deletion of posts, pages, or WPAMS records in the WordPress database
WordPress activity logs showing deletion actions performed by Subscriber-role accounts
HTTP POST requests to WPAMS plugin endpoints originating from low-privilege user sessions
Spikes in Subscriber account registration immediately preceding content loss

Detection Strategies

Audit WordPress role and capability logs for deletion events executed by accounts below Editor role
Monitor web server access logs for requests to /wp-admin/admin-ajax.php or WPAMS plugin handlers tied to delete actions
Compare current content inventory against scheduled backups to identify unauthorized removals

Monitoring Recommendations

Enable a WordPress audit logging plugin to record content deletion events with user attribution
Forward WordPress and web server logs to a centralized SIEM for correlation with authentication events
Alert on any deletion action where the executing user's role is subscriber

How to Mitigate CVE-2026-39433

Immediate Actions Required

Upgrade the WPAMS plugin to version 49.5.3 or later on all WordPress instances
Review existing Subscriber accounts and remove any that are unrecognized or inactive
Restore deleted content from backups if unauthorized deletions are confirmed
Temporarily disable the WPAMS plugin if patching cannot be completed immediately

Patch Information

The vendor addressed the issue in WPAMS version 49.5.3 by adding capability and ownership checks to the affected deletion handlers. Refer to the Patchstack Vulnerability Report for advisory details.

Workarounds

Disable open user registration under Settings → General → Membership until patching is complete
Restrict access to the WPAMS plugin endpoints using a web application firewall rule
Apply the principle of least privilege and audit user roles to ensure no unintended Subscriber accounts exist

bash

# Update the WPAMS plugin to the patched version via WP-CLI
wp plugin update apartment-management --version=49.5.3
wp plugin list --name=apartment-management --fields=name,status,version