CVE-2024-6756 is a critical vulnerability classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) affecting the WPWeb Social Auto Poster plugin for WordPress. The vulnerability arises from inadequate validation of uploaded file types in the 'wpw_auto_poster_get_image_path' function, allowing authenticated users with Contributor-level or higher privileges to upload arbitrary files to the server. Since the plugin is widely used to automate social media posting, this flaw can be exploited to upload malicious scripts or web shells, potentially leading to remote code execution (RCE). The vulnerability is present in all versions up to and including 5.3.14. Notably, an associated vulnerability (CVE-2024-6754) can be leveraged to exploit this issue with only Subscriber-level access, broadening the attack surface. The CVSS v3.1 base score is 8.8, reflecting high impact on confidentiality, integrity, and availability, with network attack vector, low attack complexity, and no user interaction required. No patches have been published yet, and no known exploits are currently observed in the wild. The vulnerability's exploitation could allow attackers to gain persistent control over affected WordPress sites, manipulate content, steal sensitive data, or use the compromised server as a pivot point for further attacks.

The impact of CVE-2024-6756 is significant for organizations running WordPress sites with the Social Auto Poster plugin installed. Successful exploitation can lead to remote code execution, enabling attackers to execute arbitrary commands on the web server. This compromises the confidentiality of sensitive data stored or processed by the site, undermines data integrity by allowing content manipulation or defacement, and threatens availability through potential server disruption or denial-of-service conditions. Attackers could also leverage compromised servers to launch further attacks within the network or use them as part of botnets. The requirement for authenticated access at Contributor level or above limits exposure somewhat; however, the related CVE-2024-6754 vulnerability potentially lowers this barrier to Subscriber-level access, increasing risk. Given WordPress's widespread use globally, the vulnerability poses a broad threat to websites ranging from small blogs to large enterprises relying on this plugin for social media automation.

To mitigate CVE-2024-6756, organizations should immediately audit and restrict user permissions, ensuring that only trusted users have Contributor-level or higher access. Implement strict role-based access controls and monitor for any unusual file upload activity, particularly files with suspicious extensions or content. Disable or remove the Social Auto Poster plugin if it is not essential. Employ Web Application Firewalls (WAFs) with custom rules to detect and block attempts to upload unauthorized file types or web shells. Regularly review server logs for anomalies related to file uploads or execution of unexpected scripts. Since no official patch is available yet, closely monitor WPWeb and WordPress security advisories for updates and apply patches promptly once released. Additionally, consider implementing file integrity monitoring and endpoint detection and response (EDR) solutions to detect and respond to potential exploitation attempts. Backup website data regularly and ensure backups are stored securely offline to enable recovery in case of compromise.