XSS in Stirlingpdf Stirling Pdf
CVE-2026-33436
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.002 (13.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 13.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.001
Affected products
- Stirlingpdf Stirling Pdf
- Stirling-Tools Stirling-Pdf — versions < 2.0.0
Weakness classification (CWE)
References
- github.com/Stirling-Tools/Stirling-PDF/security/advisories/GHSA-q5j3-4m5w-wp75 (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-33436?
- CVE-2026-33436 is a low-severity vulnerability in Stirlingpdf Stirling Pdf, classified under Improper Input Validation. CVSS score: 3.1/10. Published 2026-04-17.
- How severe is CVE-2026-33436?
- Low severity. CVSS v3 base score is 3.1 out of 10.