CVE-2024-11976: BuddyPress Shortcode Execution RCE Flaw

CVE-2024-11976 Overview

The BuddyPress plugin for WordPress contains an arbitrary shortcode execution vulnerability affecting all versions up to and including 14.3.3. This security flaw stems from improper validation of user-supplied input before passing it to the do_shortcode function. The vulnerability allows unauthenticated attackers to execute arbitrary shortcodes, potentially leading to various malicious outcomes depending on the shortcodes available on the target WordPress installation.

Critical Impact

Unauthenticated attackers can execute arbitrary shortcodes on vulnerable WordPress sites running BuddyPress, potentially leading to information disclosure, privilege escalation, or further exploitation depending on installed plugins and their registered shortcodes.

Affected Products

• BuddyPress plugin for WordPress versions up to and including 14.3.3
• WordPress installations with vulnerable BuddyPress versions
• Any WordPress site utilizing BuddyPress for community features

Discovery Timeline

• 2026-01-23 - CVE CVE-2024-11976 published to NVD
• 2026-01-26 - Last updated in NVD database

Technical Details for CVE-2024-11976

Vulnerability Analysis

This vulnerability is classified as CWE-94 (Improper Control of Generation of Code - Code Injection). The flaw exists in the BuddyPress AJAX message handling functionality, specifically within the message processing code. When handling certain AJAX requests, the plugin fails to properly validate user-controlled input before passing it to WordPress's do_shortcode() function. This design oversight allows attackers to inject and execute arbitrary shortcodes without requiring authentication.

The attack can be performed over the network without user interaction, making it particularly dangerous for public-facing WordPress installations. Successful exploitation could allow attackers to leverage any registered shortcode on the system, which may include shortcodes from other plugins that perform sensitive operations such as database queries, file operations, or authentication-related functions.

Root Cause

The root cause of this vulnerability lies in insufficient input validation within the BuddyPress AJAX message handling code. The vulnerable code path, located in bp-templates/bp-nouveau/includes/messages/ajax.php, accepts user input and processes it through do_shortcode() without adequate sanitization or validation. This allows malicious input containing shortcode syntax to be interpreted and executed by WordPress.

Attack Vector

The attack vector for CVE-2024-11976 is network-based and requires no authentication or user interaction. An attacker can craft malicious AJAX requests to the WordPress installation containing specially formatted shortcode payloads. These requests are processed by the vulnerable BuddyPress message handling code, which passes the attacker-controlled content directly to do_shortcode().

The vulnerability can be exploited by sending crafted HTTP requests to the WordPress AJAX endpoint (/wp-admin/admin-ajax.php) with malicious shortcode content embedded in the appropriate parameters. The specific exploitation technique involves targeting the message-related AJAX actions handled by BuddyPress. For detailed technical information about the vulnerable code path, refer to the WordPress BuddyPress AJAX Code reference.

Detection Methods for CVE-2024-11976

Indicators of Compromise

• Unusual AJAX requests to /wp-admin/admin-ajax.php containing shortcode syntax (square brackets with potential payloads)
• Unexpected execution of shortcode-related functionality from unauthenticated sessions
• Anomalous database queries or file access patterns originating from AJAX handlers
• Error logs showing unexpected shortcode processing or failures

Detection Strategies

• Monitor WordPress AJAX endpoint logs for suspicious request patterns containing [ and ] characters in unexpected parameters
• Implement Web Application Firewall (WAF) rules to detect shortcode injection attempts in POST data
• Enable WordPress debug logging to capture unexpected shortcode execution events
• Deploy SentinelOne Singularity to monitor for anomalous process behavior resulting from shortcode exploitation

Monitoring Recommendations

• Configure log aggregation for WordPress access logs and filter for AJAX requests to BuddyPress endpoints
• Set up alerts for high-volume AJAX requests from single IP addresses targeting message-related endpoints
• Monitor for any unexpected plugin behavior that could indicate shortcode-based attacks
• Implement file integrity monitoring on WordPress core files and plugin directories

How to Mitigate CVE-2024-11976

Immediate Actions Required

• Update BuddyPress plugin to the latest patched version immediately (versions after 14.3.3)
• Review WordPress access logs for evidence of exploitation attempts
• Temporarily disable the BuddyPress plugin if immediate patching is not possible
• Implement WAF rules to block requests containing shortcode patterns to AJAX endpoints

Patch Information

The BuddyPress development team has addressed this vulnerability in versions released after 14.3.3. Detailed information about the security fix can be found in the WordPress BuddyPress Changeset Update. Additional vulnerability details are available through the Wordfence Vulnerability Report.

Workarounds

• Restrict access to the WordPress AJAX endpoint using server-level access controls (.htaccess or nginx configuration)
• Implement a Web Application Firewall with rules specifically targeting shortcode injection patterns
• Disable the BuddyPress messaging feature temporarily if it is not critical for operations
• Use WordPress security plugins to add additional request validation layers

# Apache .htaccess example to restrict AJAX access to authenticated users
<Files admin-ajax.php>
    <RequireAll>
        Require all granted
    </RequireAll>
</Files>

# Note: This is a temporary mitigation - update the plugin as the primary fix