What the vulnerability does
01Description
The Filr – Secure document library plugin for WordPress is vulnerable to Stored Cross-Site Scripting via unrestricted file upload in all versions up to, and including, 1.2.11 due to insufficient file type restrictions in the FILR_Uploader class. This makes it possible for authenticated attackers, with Administrator-level access and above, to upload malicious HTML files containing JavaScript that will execute whenever a user accesses the uploaded file, granted they have permission to create or edit posts with the 'filr' post type.
Explanation of Vulnerability in Simple Terms
02Summary
Filr – Secure document library versions up to 1.2.11 contain an unrestricted file upload vulnerability. An authenticated administrator can upload files without proper validation, potentially allowing malicious file types to be stored on the site. The impact is limited to confidentiality and integrity of uploaded content. Update to a version newer than 1.2.11.
What an attacker can do
03Attacker Capabilities
Upload files without proper type validation to the document library.
Potential impact on your site
04Site Impact
Malicious files could be stored in your document library, potentially compromising site integrity or exposing sensitive data.
Conditions required to exploit
05Prerequisites
Attacker must have administrator privileges; no user interaction required.
Key dates
06Disclosure timeline
January 17, 2026
CVE published
April 8, 2026
Record updated
