CVE-2025-2262: WordPress Logo Slider Plugin RCE Flaw

CVE-2025-2262 Overview

The Logo Slider – Logo Showcase, Logo Carousel, Logo Gallery and Client Logo Presentation plugin for WordPress contains an arbitrary shortcode execution vulnerability affecting all versions up to and including 3.7.3. The vulnerability stems from improper validation of user-supplied input before passing it to the do_shortcode function, enabling unauthenticated attackers to execute arbitrary shortcodes on vulnerable WordPress installations.

Critical Impact

Unauthenticated attackers can execute arbitrary WordPress shortcodes, potentially leading to unauthorized access, data manipulation, or further exploitation of the WordPress site through chained shortcode functionality.

Affected Products

• Logo Slider – Logo Showcase, Logo Carousel, Logo Gallery and Client Logo Presentation plugin for WordPress versions up to and including 3.7.3
• WordPress installations using vulnerable versions of the GS Logo Slider plugin

Discovery Timeline

• 2025-03-18 - CVE CVE-2025-2262 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-2262

Vulnerability Analysis

This vulnerability is classified as CWE-862 (Missing Authorization), indicating the plugin fails to properly validate user-supplied values before executing shortcode functionality. The vulnerable code resides in the shortcode builder component (builder.php) of the GS Logo Slider plugin.

When processing user requests, the plugin accepts input that is subsequently passed to WordPress's do_shortcode() function without adequate validation or authorization checks. This allows unauthenticated remote attackers to craft malicious requests that trigger the execution of arbitrary shortcodes registered on the WordPress installation.

The attack requires no authentication, can be executed remotely over the network, and affects confidentiality, integrity, and availability of the target system. The vulnerability is particularly dangerous because WordPress shortcodes can interact with various plugin functionalities, potentially allowing attackers to chain exploits or access protected functionality.

Root Cause

The root cause is a missing authorization check (CWE-862) in the shortcode builder functionality. The plugin's builder.php file contains multiple vulnerable code paths at lines 31, 51, and 65 where user-controlled input is processed without proper validation before being passed to do_shortcode(). This architectural flaw allows any user—including unauthenticated visitors—to execute shortcode actions that should be restricted to authorized users.

Attack Vector

The attack vector is network-based, requiring no user interaction or prior authentication. An attacker can send specially crafted HTTP requests to a WordPress site running the vulnerable plugin version. The malicious request contains shortcode identifiers or parameters that the plugin processes and executes via the do_shortcode() function.

The exploitation flow involves:

1. An attacker identifies a WordPress site using the vulnerable GS Logo Slider plugin version 3.7.3 or earlier
2. The attacker crafts a malicious request targeting the shortcode builder endpoint
3. The plugin processes the request without validating authorization or sanitizing the shortcode value
4. WordPress executes the arbitrary shortcode, potentially triggering unintended functionality from other installed plugins or WordPress core

The specific vulnerable code paths can be reviewed in the WordPress Plugin Trac repository.

Detection Methods for CVE-2025-2262

Indicators of Compromise

• Unexpected POST requests to WordPress AJAX endpoints containing shortcode-related parameters from unauthenticated sources
• Anomalous execution of shortcodes not associated with normal site operation
• Unusual activity patterns in WordPress access logs targeting the GS Logo Slider plugin endpoints
• Evidence of shortcode execution in database logs or plugin activity logs

Detection Strategies

• Monitor web server access logs for suspicious requests to /wp-admin/admin-ajax.php with GS Logo Slider action parameters from unauthenticated sessions
• Implement Web Application Firewall (WAF) rules to detect and block requests containing malicious shortcode injection patterns
• Deploy runtime application security monitoring to detect unauthorized shortcode execution
• Review WordPress audit logs for unusual shortcode activity not initiated by authenticated administrators

Monitoring Recommendations

• Enable comprehensive logging for WordPress AJAX handlers and shortcode executions
• Configure alerting for multiple failed or suspicious requests to the Logo Slider plugin endpoints
• Implement file integrity monitoring on the gs-logo-slider plugin directory to detect unauthorized modifications
• Monitor for new user account creation or privilege changes that could indicate post-exploitation activity

How to Mitigate CVE-2025-2262

Immediate Actions Required

• Update the Logo Slider – Logo Showcase, Logo Carousel, Logo Gallery and Client Logo Presentation plugin to the latest patched version immediately
• If immediate patching is not possible, consider temporarily deactivating the GS Logo Slider plugin until an update can be applied
• Review WordPress access logs for any indicators of prior exploitation attempts
• Audit all shortcode registrations on the site to understand potential exploitation surface

Patch Information

The vulnerability has been addressed in WordPress Changeset 3256441. Site administrators should update to the latest version of the GS Logo Slider plugin through the WordPress dashboard or by downloading the patched version from the official WordPress plugin repository.

For detailed vulnerability information, refer to the Wordfence Vulnerability Report.

Workarounds

• Temporarily disable the GS Logo Slider plugin if an immediate update is not feasible
• Implement WAF rules to filter suspicious requests containing shortcode injection patterns targeting the plugin's AJAX endpoints
• Restrict access to WordPress AJAX endpoints at the web server level for unauthenticated users where feasible
• Use a WordPress security plugin to add additional access control layers around AJAX functionality

# Example: Temporary .htaccess rule to block unauthenticated AJAX requests to the plugin
# Add to WordPress root .htaccess (use with caution, may affect legitimate functionality)
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/wp-admin/admin-ajax\.php
RewriteCond %{QUERY_STRING} action=gs_logo [NC,OR]
RewriteCond %{REQUEST_BODY} action=gs_logo [NC]
RewriteCond %{HTTP_COOKIE} !wordpress_logged_in
RewriteRule .* - [F,L]
</IfModule>