CVE-2025-15158 is a critical vulnerability identified in the WP Enable WebP plugin for WordPress, affecting all versions up to and including 1.0. The vulnerability stems from improper validation of file types in the 'wpse_file_and_ext_webp' function, which fails to adequately restrict the types of files that authenticated users can upload. Specifically, users with Author-level privileges or higher can exploit this flaw to upload arbitrary files, including potentially malicious scripts, to the web server hosting the WordPress site. This unrestricted file upload vulnerability is categorized under CWE-434, which involves the upload of files with dangerous types that can lead to remote code execution (RCE). The attack vector is network-based and requires only low privileges (Author role) without any additional user interaction, making it relatively easy to exploit. Successful exploitation can lead to full compromise of the web server, allowing attackers to execute arbitrary code, manipulate site content, steal sensitive data, or disrupt service availability. The vulnerability has a CVSS v3.1 score of 8.8, reflecting its high impact on confidentiality, integrity, and availability. Although no public exploits are currently known, the risk is significant given the widespread use of WordPress and the plugin in question. The lack of available patches at the time of reporting necessitates immediate attention from site administrators to implement mitigations or monitor for suspicious activity.

The impact of CVE-2025-15158 is substantial for organizations running WordPress sites with the WP Enable WebP plugin installed. Exploitation allows attackers with Author-level access to upload arbitrary files, potentially leading to remote code execution on the web server. This can result in full site compromise, data breaches involving sensitive user or business information, defacement, and service disruption. The integrity of website content and availability of services can be severely affected, damaging organizational reputation and trust. Since WordPress powers a significant portion of the web, including many business, government, and e-commerce sites, the scope of affected systems is large. Attackers could leverage this vulnerability to establish persistent backdoors, pivot within internal networks, or launch further attacks against connected systems. The requirement for only Author-level privileges lowers the barrier for exploitation, as many WordPress sites have multiple users with such roles. The vulnerability thus poses a critical risk to the confidentiality, integrity, and availability of affected web environments worldwide.

To mitigate CVE-2025-15158, organizations should immediately audit their WordPress installations to identify the presence of the WP Enable WebP plugin and verify the version in use. Since no official patch is currently available, administrators should consider the following specific actions: 1) Temporarily disable or uninstall the WP Enable WebP plugin to eliminate the attack vector until a patch is released. 2) Restrict user roles and permissions rigorously, ensuring that only trusted users have Author-level or higher access. 3) Implement web application firewall (WAF) rules to detect and block suspicious file upload attempts, particularly those attempting to upload executable or script files. 4) Monitor server logs and WordPress activity logs for unusual file upload behavior or unauthorized access attempts. 5) Harden the web server environment by disabling execution permissions in upload directories to prevent execution of uploaded files. 6) Regularly back up website data and configurations to enable rapid recovery in case of compromise. 7) Stay informed of vendor updates and apply patches promptly once available. These targeted mitigations go beyond generic advice by focusing on immediate risk reduction and detection tailored to this vulnerability's characteristics.