CVE-2025-52726: CouponXxL CPT Privilege Escalation Flaw

CVE-2025-52726 Overview

CVE-2025-52726 is a privilege escalation vulnerability in the pebas CouponXxL Custom Post Types (couponxxl-cpt) WordPress plugin. The flaw stems from incorrect privilege assignment [CWE-266] and affects all plugin versions up to and including 3.0. An unauthenticated network attacker can exploit the issue to obtain elevated privileges within an affected WordPress site. The vulnerability requires no user interaction and no prior authentication, making it suitable for opportunistic exploitation against exposed WordPress installations running the plugin.

Critical Impact

Remote attackers can escalate privileges on WordPress sites running CouponXxL Custom Post Types 3.0 or earlier without authentication or user interaction.

Affected Products

• pebas CouponXxL Custom Post Types (couponxxl-cpt) plugin for WordPress
• All versions from initial release through version 3.0
• WordPress sites with the plugin installed and activated

Discovery Timeline

• 2025-06-27 - CVE-2025-52726 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-52726

Vulnerability Analysis

The vulnerability is classified under [CWE-266] Incorrect Privilege Assignment. The couponxxl-cpt plugin assigns privileges to users or actions in a manner that does not align with the intended access control model. As a result, an actor can perform operations or assume a role that should be restricted to higher-privileged accounts.

The issue is reachable over the network without authentication or user interaction. Successful exploitation grants the attacker elevated capabilities within WordPress, which can be leveraged to manipulate content, modify plugin or site configuration, and pivot toward broader site compromise. According to Patchstack's vulnerability analysis, the flaw affects all versions of the plugin through 3.0.

Root Cause

The root cause is improper enforcement of role and capability checks within the plugin's request handling logic. The plugin assigns privileges without adequately validating the requesting user's existing role or authentication state. This permits unauthenticated requests to invoke functionality that should be gated behind administrator-level capability checks such as current_user_can().

Attack Vector

The attack vector is network-based. An attacker sends crafted HTTP requests to plugin endpoints exposed by a vulnerable WordPress installation. Because the vulnerable code path does not verify the caller's authorization, the request executes with elevated effective privileges. No credentials, tokens, or user interaction are required.

No verified public proof-of-concept code is currently available. See the Patchstack advisory for additional technical context.

Detection Methods for CVE-2025-52726

Indicators of Compromise

• Unexpected creation of WordPress administrator or editor accounts in wp_users and wp_usermeta tables
• Unauthorized modification of user roles or capabilities tied to the couponxxl-cpt plugin
• HTTP requests to couponxxl-cpt plugin endpoints from unauthenticated sources followed by privileged actions
• New or modified plugin and theme files written shortly after suspicious requests to plugin paths

Detection Strategies

• Inventory WordPress sites and identify any installation of the couponxxl-cpt plugin at version 3.0 or earlier
• Review web server access logs for requests targeting plugin paths under /wp-content/plugins/couponxxl-cpt/ and correlate with subsequent administrative actions
• Audit recent changes to user roles, especially privilege grants that lack a corresponding authenticated administrator session
• Monitor WordPress audit logs for role assignments performed without an originating logged-in user context

Monitoring Recommendations

• Enable WordPress activity logging plugins to record user role changes, plugin installations, and option updates
• Forward web server and WordPress logs to a centralized SIEM for correlation against the indicators above
• Alert on creation of new administrator accounts outside change-management windows
• Track file integrity for the wp-content/plugins/ and wp-content/themes/ directories

How to Mitigate CVE-2025-52726

Immediate Actions Required

• Identify all WordPress installations running couponxxl-cpt version 3.0 or earlier and prioritize them for remediation
• Deactivate and remove the plugin if a fixed version is not available or cannot be applied immediately
• Audit existing WordPress users and remove any unauthorized accounts or unexpected role assignments
• Rotate credentials for all administrator accounts and force a password reset for all users

Patch Information

At the time of writing, the Patchstack advisory lists affected versions as "n/a through <= 3.0" with no fixed version published. Operators should monitor the vendor and Patchstack listing for an updated release and apply it as soon as it becomes available.

Workarounds

• Remove the couponxxl-cpt plugin until a patched version is released
• Restrict access to /wp-admin/ and plugin endpoints using web application firewall (WAF) rules or IP allowlists
• Deploy virtual patching rules from WordPress security vendors that block unauthenticated privilege escalation attempts against this plugin
• Apply the principle of least privilege to existing WordPress accounts and disable unused administrator accounts

# Configuration example: locate vulnerable plugin installations
find /var/www -type d -name 'couponxxl-cpt' -print

# Inspect plugin version from the main plugin file header
grep -i 'Version:' /var/www/*/wp-content/plugins/couponxxl-cpt/*.php

# Disable the plugin via WP-CLI until a patch is available
wp plugin deactivate couponxxl-cpt --path=/var/www/html
wp plugin delete couponxxl-cpt --path=/var/www/html