CVE-2026-24387: WP Quick Post Duplicator Auth Bypass Flaw

CVE-2026-24387 Overview

CVE-2026-24387 is a missing authorization vulnerability [CWE-862] in the WP Quick Post Duplicator plugin developed by Arul Prasad J for WordPress. The flaw stems from incorrectly configured access control on plugin functionality, allowing authenticated users with low privileges to invoke actions that should require higher authorization. The issue affects all versions of WP Quick Post Duplicator up to and including 2.1.

Critical Impact
Authenticated attackers with low-level WordPress accounts can exploit broken access control to duplicate posts or perform restricted plugin operations without proper authorization checks.

Affected Products

WP Quick Post Duplicator plugin versions through 2.1
WordPress sites with the wp-quick-post-duplicator plugin installed
All deployments using Arul Prasad J's WP Quick Post Duplicator

Discovery Timeline

2026-01-22 - CVE-2026-24387 published to NVD
2026-04-28 - Last updated in NVD database

Technical Details for CVE-2026-24387

Vulnerability Analysis

The vulnerability is a broken access control issue categorized under CWE-862 (Missing Authorization). The plugin exposes functionality without verifying that the requesting user holds the appropriate WordPress capability or role. An authenticated attacker with low privileges, such as a subscriber or contributor, can invoke duplication actions intended for editors or administrators.

The attack requires network access and low privileges. No user interaction is necessary. The impact is limited to integrity, since the attacker can create unauthorized post duplicates but cannot directly read confidential data or disrupt site availability through this flaw alone.

Root Cause

The root cause is the absence of capability checks within the plugin's action handlers. WordPress plugins typically validate authorization using current_user_can() before executing privileged operations. WP Quick Post Duplicator versions through 2.1 omit or incorrectly configure these checks on the duplication endpoint, treating any authenticated session as sufficient.

Attack Vector

An attacker authenticates to the target WordPress site using any valid low-privilege account. The attacker then issues a crafted request to the plugin's duplication endpoint, triggering post duplication operations that should be restricted. Because the plugin does not validate the user's role or capability, the action succeeds. Refer to the Patchstack Vulnerability Report for additional technical detail.

Detection Methods for CVE-2026-24387

Indicators of Compromise

Unexpected duplicate posts appearing in the WordPress database created by low-privilege accounts
HTTP requests to plugin endpoints from users without editor or administrator roles
Anomalous spikes in wp_posts insertions tied to subscriber or contributor user IDs

Detection Strategies

Audit WordPress activity logs for post duplication events initiated by accounts below editor level
Monitor web server access logs for requests to wp-quick-post-duplicator action handlers from non-privileged sessions
Review the post_author field on recently created posts and correlate with the originating user's role

Monitoring Recommendations

Enable a WordPress audit logging plugin to capture post creation and duplication events with user attribution
Forward WordPress and web server logs to a centralized SIEM for correlation and alerting
Establish alerts when low-privilege accounts generate post creation activity outside expected patterns

How to Mitigate CVE-2026-24387

Immediate Actions Required

Deactivate the WP Quick Post Duplicator plugin until a patched version is installed
Audit existing WordPress user accounts and remove unnecessary low-privilege accounts
Review recent post creation activity to identify any unauthorized duplications
Apply the principle of least privilege across all WordPress roles and capabilities

Patch Information

No fixed version is referenced in the current advisory. The vulnerability affects WP Quick Post Duplicator through version 2.1. Monitor the Patchstack Vulnerability Report and the plugin repository for an updated release that adds proper capability checks.

Workarounds

Remove or deactivate the wp-quick-post-duplicator plugin from affected WordPress installations
Restrict access to /wp-admin/ paths using web server rules or a web application firewall
Implement a virtual patch via a WordPress security plugin that blocks unauthenticated or low-privilege requests to the vulnerable endpoint
Limit registration to trusted users and disable open subscriber sign-up if not required

bash

# Configuration example: disable the plugin via WP-CLI
wp plugin deactivate wp-quick-post-duplicator
wp plugin delete wp-quick-post-duplicator