CVE-2026-33436: Stirlingpdf Stirling PDF

Medium severity, CVSS 6.1. EPSS: 0.2% chance of exploitation in the next 30 days.

Stirling-PDF is a locally hosted web application that facilitates various operations on PDF files. In versions prior to 2.0.0, file upload endpoints render user-supplied filenames directly into HTML using unsafe methods like innerHTML without sanitization. An attacker can craft a file with a malicious filename containing JavaScript that executes in the uploading user's browser context, resulting in reflected XSS. The issue affects numerous upload endpoints across the application. The issue has been fixed in version 2.0.0.

Affected products

• Stirlingpdf Stirling PDF: before 2.0.0 (fixed in 2.0.0)

Published 2026-04-17. Last modified 2026-06-17.