The vulnerability identified as CVE-2026-1065 affects the 10Web Form Maker plugin for WordPress, a popular drag-and-drop contact form builder. The core issue stems from the plugin's default allowlist for file uploads, which includes SVG files. SVG files can contain embedded JavaScript, and the plugin's validation relies on weak substring-based extension checks rather than robust MIME type or content validation. This flaw enables unauthenticated attackers to upload malicious SVG files through form upload fields. Once uploaded, these SVG files can execute JavaScript in the context of the victim's browser when administrators or site visitors view the file, resulting in stored cross-site scripting (XSS). The vulnerability does not require any authentication or user interaction, making it easier to exploit remotely. The CVSS 3.1 score of 7.2 (AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N) indicates network exploitable, low attack complexity, no privileges or user interaction needed, with a scope change and partial confidentiality and integrity impact but no availability impact. Although no public exploits have been reported yet, the vulnerability's nature and ease of exploitation make it a significant threat to WordPress sites using this plugin. The absence of patches at the time of reporting necessitates immediate mitigation steps by administrators.

For European organizations, this vulnerability poses a significant risk to the confidentiality and integrity of web applications using the 10Web Form Maker plugin. Exploitation could lead to session hijacking of administrators or users, unauthorized actions performed on behalf of victims, and potential data leakage or defacement of websites. This can damage organizational reputation, lead to regulatory non-compliance (e.g., GDPR breaches if personal data is exposed), and disrupt business operations. Since WordPress is widely used across Europe for corporate, governmental, and e-commerce websites, the attack surface is considerable. The vulnerability's ability to be exploited without authentication increases the likelihood of automated or opportunistic attacks. Additionally, the stored XSS nature means that once a malicious SVG is uploaded, it can affect multiple users repeatedly until remediated. This is particularly critical for organizations relying on web forms for customer interaction, support, or data collection.

1. Immediately remove SVG files from the allowed upload types in the 10Web Form Maker plugin configuration to prevent malicious file uploads. 2. Implement strict server-side validation of uploaded files, including MIME type verification and content inspection, rather than relying solely on file extensions. 3. Employ Content Security Policy (CSP) headers to restrict the execution of inline scripts and reduce the impact of XSS attacks. 4. Monitor and audit file upload directories for unexpected or suspicious SVG files and remove any untrusted uploads. 5. Restrict permissions on uploaded files and directories to minimize the risk of execution. 6. Keep WordPress core, plugins, and themes updated and apply security patches promptly once 10Web releases a fix for this vulnerability. 7. Consider using web application firewalls (WAFs) with rules to detect and block malicious SVG uploads or XSS payloads. 8. Educate site administrators about the risks of file uploads and encourage regular security reviews of form configurations. 9. If possible, disable file uploads on forms that do not require them to reduce the attack surface.