CVE-2024-54359: Banner System Auth Bypass Vulnerability

CVE-2024-54359 Overview

CVE-2024-54359 is a Missing Authorization vulnerability [CWE-862] affecting the Saul Morales Pacheco Banner System plugin for WordPress. The flaw impacts all versions of banner-system up to and including 1.0.0. Attackers can exploit incorrectly configured access control security levels to invoke plugin actions without proper authorization checks. The vulnerability is exploitable over the network, requires no authentication, and needs no user interaction. Successful exploitation leads to high impact on integrity and low impact on availability, while confidentiality is unaffected.

Critical Impact
Unauthenticated remote attackers can modify banner content and plugin state on affected WordPress sites due to missing authorization checks.

Affected Products

Saul Morales Pacheco Banner System plugin for WordPress
All versions from initial release through 1.0.0
WordPress sites with the banner-system plugin installed and activated

Discovery Timeline

2024-12-16 - CVE-2024-54359 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-54359

Vulnerability Analysis

The Banner System plugin exposes functionality without verifying that the requesting user holds the required capability or role. This is a classic Missing Authorization weakness classified under [CWE-862]. The plugin's action handlers omit calls to WordPress capability functions such as current_user_can() and do not validate nonces or session context before performing state-changing operations.

Because the attack vector is network-based and no privileges or user interaction are required, any remote actor who can reach the WordPress site can trigger the affected endpoints. The impact profile shows high integrity damage, meaning attackers can create, modify, or delete banner data managed by the plugin. The low availability impact suggests that some operations may disrupt normal plugin behavior on the site.

Root Cause

The root cause is incorrectly configured access control security levels within the plugin's request handlers. Sensitive actions were registered through WordPress hooks such as admin_post_ or wp_ajax_nopriv_ without corresponding authorization gating. Refer to the Patchstack WordPress Plugin Vulnerability advisory for the confirmed technical details.

Attack Vector

An unauthenticated attacker sends crafted HTTP requests to the plugin's exposed endpoints on a target WordPress site. Because authorization checks are missing, the plugin processes the request as if it originated from a permitted user. The attacker can then alter banner records, configuration values, or other plugin-managed content. No credentials, tokens, or user interaction are required to complete the attack.

No public proof-of-concept exploit is currently referenced in the vulnerability data, and the flaw is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2024-54359

Indicators of Compromise

Unexpected changes to banner content, links, or images displayed on the WordPress site
HTTP POST requests to admin-ajax.php or admin-post.php referencing Banner System actions from unauthenticated sources
New or modified rows in database tables associated with the banner-system plugin without corresponding administrator activity
Access log entries showing repeated requests to plugin endpoints from a single external IP address

Detection Strategies

Inventory all WordPress installations and identify sites running the banner-system plugin at version 1.0.0 or earlier
Correlate web server access logs with plugin action names to identify unauthenticated invocations of state-changing endpoints
Monitor WordPress audit logs for banner creation, modification, or deletion events that do not map to a legitimate administrator session

Monitoring Recommendations

Enable WordPress activity logging plugins to capture all plugin-level changes with user attribution
Forward web server and application logs to a centralized analytics platform for anomaly detection
Alert on HTTP 200 responses to plugin endpoints when the request lacks a valid authenticated session cookie

How to Mitigate CVE-2024-54359

Immediate Actions Required

Identify affected WordPress sites running the Banner System plugin at version 1.0.0 or earlier
Deactivate and remove the banner-system plugin if no patched release is available for your environment
Restrict access to wp-admin, admin-ajax.php, and admin-post.php at the web application firewall or reverse proxy layer
Review banner content and plugin database tables for unauthorized modifications

Patch Information

At the time of publication, the vulnerability affects Banner System versions through 1.0.0. No fixed version is referenced in the available advisory data. Administrators should consult the Patchstack advisory for the latest remediation status and consider removing the plugin until a patched release is confirmed.

Workarounds

Uninstall the plugin entirely if banner functionality is not business-critical
Apply web application firewall rules that block unauthenticated requests to the plugin's action endpoints
Enforce IP allow-listing for WordPress administrative paths to reduce exposure of vulnerable endpoints
Replace Banner System with an actively maintained alternative that implements proper capability checks

bash

# Configuration example: block unauthenticated access to Banner System endpoints via .htaccess
<IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteCond %{QUERY_STRING} action=banner_system [NC]
  RewriteCond %{HTTP_COOKIE} !wordpress_logged_in_ [NC]
  RewriteRule ^wp-admin/admin-(ajax|post)\.php$ - [F,L]
</IfModule>