CVE-2024-6311 is a vulnerability classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) found in the Funnelforms Free WordPress plugin, specifically in the 'af2_add_font' function. This function fails to validate file types during upload, allowing authenticated users with administrator or higher privileges to upload arbitrary files to the server. Since the plugin is widely used for creating interactive contact forms and multi-step form builders with drag-and-drop editors, this vulnerability exposes a critical attack vector. The lack of file type validation means attackers can upload malicious scripts or web shells, potentially leading to remote code execution (RCE). The vulnerability affects all versions up to 3.7.3.2, with no patches currently available. The CVSS v3.1 score of 7.2 indicates a high severity, with network attack vector, low attack complexity, high privileges required, no user interaction, and high impact on confidentiality, integrity, and availability. Although exploitation requires authenticated admin access, which limits the attack surface, the consequences of a successful exploit are severe, including full system compromise and data breaches. No known exploits have been reported in the wild yet, but the vulnerability represents a significant risk to WordPress sites using this plugin.

The primary impact of CVE-2024-6311 is the potential for remote code execution on affected WordPress servers, which can lead to complete system compromise. Attackers with administrator privileges can upload malicious files, such as web shells or backdoors, enabling persistent access, data theft, defacement, or use of the server in further attacks. Confidentiality is at risk as sensitive data stored on the server can be exfiltrated. Integrity is compromised because attackers can alter website content or inject malicious code. Availability may also be affected if attackers disrupt services or deploy ransomware. Organizations relying on the Funnelforms Free plugin face increased risk of targeted attacks, especially if administrator credentials are compromised through phishing or other means. The vulnerability's exploitation could also facilitate lateral movement within networks, escalating the threat beyond the initial WordPress environment. Given the widespread use of WordPress globally, the potential scale of impact is substantial, particularly for organizations with high-value web assets or sensitive customer data.

Since no official patches are currently available, organizations should take immediate steps to mitigate the risk. First, restrict administrator access to trusted personnel and enforce strong authentication mechanisms, including multi-factor authentication (MFA), to reduce the risk of credential compromise. Disable or remove the Funnelforms Free plugin if it is not essential to reduce the attack surface. If the plugin is necessary, monitor file upload directories for suspicious files and implement web application firewalls (WAFs) with rules to detect and block malicious file uploads or execution attempts. Regularly audit administrator accounts and review logs for unusual activity. Consider deploying intrusion detection/prevention systems (IDS/IPS) to identify exploitation attempts. Additionally, isolate WordPress environments from critical backend systems to limit lateral movement. Stay informed about vendor updates and apply patches promptly once released. Finally, conduct regular backups and ensure recovery plans are tested to minimize downtime in case of compromise.