CVE-2024-13423 Overview
The Sparkling theme for WordPress contains a missing authorization vulnerability [CWE-862] in versions up to and including 2.4.9. The sparkling_activate_plugin and sparkling_deactivate_plugin functions lack capability checks, allowing unauthenticated attackers to activate or deactivate arbitrary plugins on affected sites. An attacker exploiting this flaw can disable security plugins or enable vulnerable ones to expand the attack surface on the target site.
Critical Impact
Unauthenticated network attackers can toggle plugin state on affected WordPress sites, disabling security controls or activating dormant plugins to enable further compromise.
Affected Products
- Sparkling theme for WordPress versions up to and including 2.4.9
- WordPress installations using the vulnerable Sparkling welcome screen component class-sparkling-welcome.php
- Any site relying on the theme's default plugin management handlers without patched capability checks
Discovery Timeline
- 2025-03-05 - CVE-2024-13423 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-13423
Vulnerability Analysis
The Sparkling theme exposes two AJAX-reachable functions, sparkling_activate_plugin and sparkling_deactivate_plugin, that manage plugin state from the theme's welcome screen. These handlers, defined in inc/welcome-screen/class-sparkling-welcome.php, execute plugin state changes without verifying the caller holds the activate_plugins capability or a valid nonce. As a result, unauthenticated HTTP requests can trigger plugin activation or deactivation. An attacker can deactivate wordfence, sucuri, or other security plugins to remove monitoring, or activate plugins with known vulnerabilities to pivot into remote code execution paths.
Root Cause
The root cause is a missing authorization check [CWE-862] on privileged theme callbacks. The functions at lines 69 and 82 of class-sparkling-welcome.php invoke WordPress plugin management APIs without calling current_user_can('activate_plugins') and without validating a nonce via check_ajax_referer. Sensitive state-changing operations were exposed to any caller reaching the AJAX endpoint.
Attack Vector
Exploitation is remote and unauthenticated. An attacker sends a crafted HTTP request to the site's admin-ajax.php endpoint referencing the vulnerable action name and passing the target plugin path as a parameter. No user interaction is required, and no credentials are needed. The server processes the request and toggles the specified plugin's activation state. See the WordPress Sparkling Welcome Screen Code and the Wordfence Vulnerability Analysis for the specific handler code paths.
Detection Methods for CVE-2024-13423
Indicators of Compromise
- Unexpected changes to the active_plugins option in the WordPress database wp_options table
- HTTP POST requests to admin-ajax.php containing action=sparkling_activate_plugin or action=sparkling_deactivate_plugin
- Unauthenticated requests referencing the Sparkling welcome screen action names in web server access logs
- Security or logging plugins transitioning to a deactivated state without corresponding administrator sessions
Detection Strategies
- Alert on any request to admin-ajax.php where the action parameter matches sparkling_* and the request lacks an authenticated session cookie
- Correlate WordPress audit logs with web server logs to identify plugin state transitions that do not map to a logged-in administrator
- Baseline the expected set of active plugins and alert on drift, particularly deactivation of security controls
Monitoring Recommendations
- Ingest WordPress access logs and application audit events into a centralized SIEM for correlation
- Monitor file integrity of the wp-content/plugins directory and changes to plugin metadata
- Track plugin activation events through WordPress hooks such as activated_plugin and deactivated_plugin
How to Mitigate CVE-2024-13423
Immediate Actions Required
- Update the Sparkling theme to a version later than 2.4.9 that includes the capability and nonce checks introduced in WordPress Theme Changeset #266657
- If a patched version is unavailable, switch to an alternative theme until a fix is applied
- Audit the site's currently active plugins and revert any unauthorized activation or deactivation
- Restrict access to admin-ajax.php from untrusted networks using a web application firewall rule
Patch Information
The vendor addressed the vulnerability in the Sparkling theme following version 2.4.9 via WordPress Theme Changeset #266657, which introduces capability and nonce validation on the affected handlers. Site administrators should apply the update through the WordPress theme updater or by replacing the theme files.
Workarounds
- Deploy a web application firewall rule blocking unauthenticated POST requests to admin-ajax.php that reference sparkling_activate_plugin or sparkling_deactivate_plugin
- Remove or comment out the wp_ajax_nopriv_ action hooks that expose the handlers to unauthenticated users if custom patching is required
- Disable the Sparkling welcome screen component until the theme is updated
# Configuration example: ModSecurity rule to block the vulnerable actions
SecRule REQUEST_URI "@contains /wp-admin/admin-ajax.php" \
"chain,phase:2,deny,status:403,id:1013423,\
msg:'Block CVE-2024-13423 Sparkling theme plugin toggle'"
SecRule ARGS:action "@rx ^sparkling_(de)?activate_plugin$"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
