CVE-2026-33436 Details
Description
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.
A reflected cross-site scripting vulnerability has been identified in Stirling-PDF versions prior to 2.0.0. The issue arises in file upload endpoints that directly render user-supplied filenames into HTML using unsafe methods, such as innerHTML, without proper sanitization. This allows an attacker to upload a file with a malicious filename containing JavaScript, which executes in the context of the uploading user's browser. The vulnerability is present across various upload endpoints in the application.
Users are advised to update to Stirling-PDF version 2.0.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 20, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Stirling-Tools/Stirling-PDF/security/advisories/GHSA-q5j3-4m5w-wp75 | CISA-ADP | ExploitVendor Advisory |
| https://github.com/Stirling-Tools/Stirling-PDF/security/advisories/GHSA-q5j3-4m5w-wp75 | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
| CWE-116 | Improper Encoding or Escaping of Output | [email protected] |
| CWE-20 | Improper Input Validation | [email protected] |
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| stirlingpdf stirling pdf | < 2.0.0 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 13, 2026 | Initial Analysis | [email protected] |
| Apr 20, 2026 | CVE Modified | CISA-ADP |
| Apr 17, 2026 | New CVE Received | [email protected] |