PT-2026-33506 · Stirling Tools · Stirling-Pdf

Published 2026-04-17 · Updated 2026-04-17 · CVE-2026-33436

Mitre

CVSS v3.1

3.1

Low

AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

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.

Fix

RCE

Improper Encoding or Escaping of Output

XSS

Weakness Enumeration

CWE-20

CWE-116

CWE-79

Related Identifiers

CVE-2026-33436

Affected Products

Stirling-Pdf

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-33436 · Security Note
• https://github.com/Stirling-Tools/Stirling-PDF/security/advisories/GHSA-q5j3-4m5w-wp75 · Note