CVE-2024-6315 identifies a critical vulnerability in the unitecms Blox Page Builder plugin for WordPress, specifically in the 'handleUploadFile' function. This function lacks proper validation of uploaded file types, allowing authenticated users with contributor-level or higher permissions to upload arbitrary files to the server. Because the plugin does not restrict file types, attackers can upload malicious scripts or executable files, potentially leading to remote code execution (RCE). The vulnerability affects all versions up to and including 1.0.65. The CVSS 3.1 base score is 8.8, reflecting high impact across confidentiality, integrity, and availability, with low attack complexity and requiring only low privileges (authenticated contributor). No user interaction beyond authentication is needed, and the scope is unchanged but affects the web server hosting the WordPress site. Although no known exploits are currently in the wild, the vulnerability presents a significant risk due to the widespread use of WordPress and the common practice of granting contributor permissions to multiple users. Attackers exploiting this vulnerability could gain persistent access, deface websites, steal sensitive data, or use the compromised server as a foothold for further attacks. The CWE-434 classification highlights the core issue of unrestricted file upload, a common and dangerous web application vulnerability.

The impact of CVE-2024-6315 is substantial for organizations running WordPress sites with the vulnerable Blox Page Builder plugin. Successful exploitation can lead to remote code execution, allowing attackers to execute arbitrary commands on the web server. This can result in full site compromise, data theft, defacement, or use of the server as a launchpad for lateral movement within the network. Confidentiality is at risk as attackers may access sensitive user or business data. Integrity is compromised through unauthorized modification of website content or backend files. Availability may be affected if attackers deploy ransomware or disrupt services. Given the low privilege required (contributor-level) and no need for user interaction, the vulnerability is relatively easy to exploit once an attacker gains authenticated access. This elevates the risk for organizations with multiple contributors or weak authentication controls. The lack of a patch at the time of reporting further increases exposure. The threat affects a broad range of sectors relying on WordPress for web presence, including e-commerce, media, education, and government websites.

To mitigate CVE-2024-6315, organizations should immediately restrict contributor-level permissions to trusted users only and review existing user roles to minimize unnecessary upload privileges. Implement additional server-side validation to restrict allowed file types beyond what the plugin provides, such as blocking executable extensions (.php, .exe, .js) and allowing only safe media types. Employ web application firewalls (WAFs) with rules to detect and block suspicious file upload attempts. Monitor server logs and file system changes for unusual activity indicative of exploitation attempts. Where possible, isolate the WordPress environment using containerization or sandboxing to limit the impact of a successful exploit. Regularly back up website data and test restoration procedures to recover quickly from potential compromises. Stay informed on updates from the plugin vendor and apply patches promptly once available. Consider disabling or replacing the Blox Page Builder plugin if immediate patching is not feasible. Finally, enforce strong authentication mechanisms, such as multi-factor authentication (MFA), to reduce the risk of credential compromise that could lead to exploitation.