CVE-2024-11270 is a vulnerability classified under CWE-862 (Missing Authorization) found in the WordPress Webinar Plugin – WebinarPress, affecting all versions up to 1.33.24. The issue arises because the plugin's 'sync-import-imgs' function lacks proper capability checks, allowing authenticated users with minimal privileges (subscriber-level or higher) to invoke this function without sufficient authorization. Additionally, the plugin fails to validate file types when creating files, enabling attackers to upload arbitrary files, including potentially malicious scripts. This combination can lead to remote code execution (RCE) on the hosting server. The vulnerability has a CVSS 3.1 base score of 8.8, indicating high severity, with an attack vector over the network, low attack complexity, requiring privileges but no user interaction, and impacting confidentiality, integrity, and availability. Although no public exploits are currently known, the ease of exploitation and the broad impact make this a critical risk for affected WordPress sites. The vulnerability highlights the importance of enforcing strict authorization checks and validating user inputs, especially in plugins that handle file operations.

The vulnerability allows attackers with subscriber-level access or higher to create arbitrary files on the server, which can lead to remote code execution. This compromises the confidentiality, integrity, and availability of the affected WordPress sites. Attackers could deploy backdoors, deface websites, steal sensitive data, or disrupt services. Given the widespread use of WordPress and the popularity of webinar plugins, many organizations running online events, education platforms, or marketing webinars could be affected. The attack requires only authenticated access, which could be obtained through compromised credentials or weak user management, increasing the risk. Exploitation could lead to full server compromise, lateral movement within hosting environments, and damage to organizational reputation and trust.

Organizations should immediately update the WordPress Webinar Plugin – WebinarPress to a patched version once available. Until a patch is released, administrators should restrict plugin usage to trusted users only and review user roles to minimize subscriber-level accounts. Implement web application firewall (WAF) rules to detect and block suspicious requests targeting the 'sync-import-imgs' function or unusual file creation attempts. Conduct regular audits of uploaded files and server directories for unauthorized files or scripts. Employ principle of least privilege for WordPress user roles and enforce strong authentication mechanisms such as multi-factor authentication (MFA). Monitor logs for unusual activity related to file uploads or plugin functions. Consider temporarily disabling the plugin if it is not critical to operations. Finally, maintain regular backups to enable recovery in case of compromise.