CVE-2024-6518: 
WordPress vulnerability analysis and mitigation

The Contact Form Plugin by Fluent Forms for Quiz, Survey, and Drag & Drop WP Form Builder plugin for WordPress contains a Stored Cross-Site Scripting vulnerability (CVE-2024-6518) affecting all versions up to and including 5.1.19. The vulnerability was discovered in July 2024 and was patched in version 5.1.20 (NVD, Patchstack).

The vulnerability stems from insufficient input sanitization and output escaping in the plugin. This security flaw has been assigned a CVSS v3.1 Base Score of 4.8 (Medium) with the vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N. The vulnerability is classified as CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (NVD).

When exploited, this vulnerability allows authenticated attackers with Administrator-level access to inject arbitrary web scripts into pages. These malicious scripts will execute whenever a user accesses the injected page, potentially compromising user data or performing unauthorized actions on behalf of the visiting users (NVD).

The recommended mitigation is to update the Fluent Forms plugin to version 5.1.20 or later, which contains the security fix for this vulnerability. The patch was released as part of version 5.1.20 on July 25, 2024 (WordPress Plugin).