Verificatie SMS met TargetSMS <= 1.5 - Ongemachtigde Beperkte Remote Code Execution

The impact of CVE-2025-3776 is significant due to the ease of exploitation and the potential for complete system takeover. An attacker can leverage this vulnerability to execute arbitrary PHP code on the WordPress server, allowing them to modify website content, steal sensitive data (user credentials, database information), install malware, or even gain full control of the server. The lack of authentication required for exploitation further amplifies the risk, making it accessible to a wide range of attackers. Successful exploitation could mirror the impact of other WordPress plugin vulnerabilities where attackers have leveraged RCE to deploy webshells and establish persistent access.

WordPress websites utilizing the Verification SMS with TargetSMS plugin, particularly those running older, unpatched versions (0.0.0 – 1.5), are at significant risk. Shared hosting environments are especially vulnerable as they often have limited control over plugin updates and security configurations. Websites relying on this plugin for SMS verification services are also at increased risk of data breaches and service disruption.

• wordpress / composer / npm:

grep -r 'targetvr_ajax_handler' /var/www/html/wp-content/plugins/verification-sms-with-targetsms/

• wordpress / composer / npm:

wp plugin list | grep 'verification-sms-with-targetsms'

• wordpress / composer / npm:

curl -I http://your-wordpress-site.com/wp-admin/admin-ajax.php?action=targetvr_ajax_handler

• generic web: Review WordPress access logs for requests to /wp-admin/admin-ajax.php?action=targetvrajaxhandler originating from unusual IP addresses.

1. 2025-04-24Disclosure

   disclosure

1. Gereserveerd2025-04-17
2. Gepubliceerd2025-04-24
3. Gewijzigd2026-04-08
4. EPSS bijgewerkt2026-03-23

The primary mitigation for CVE-2025-3776 is to upgrade the Verification SMS with TargetSMS plugin to a patched version as soon as it becomes available. Until a patch is released, consider disabling the plugin entirely to prevent exploitation. As a temporary workaround, implement a Web Application Firewall (WAF) rule to block requests to the 'targetvrajaxhandler' endpoint. Additionally, review WordPress user roles and permissions to ensure that only authorized users have access to sensitive functions. Monitor WordPress access logs for suspicious activity, particularly requests originating from unknown IP addresses targeting the vulnerable endpoint. After upgrading, confirm the fix by attempting to trigger the vulnerable function and verifying that it is properly validated.