CVE-2026-33436: CWE-20: Improper Input Validation in Stirling-Tools Stirling-PDF
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.
AI Analysis
Technical Summary
Stirling-PDF, a locally hosted web application for PDF file operations, improperly validates input by rendering user-supplied filenames directly into HTML without sanitization. This leads to a reflected XSS vulnerability in versions before 2.0.0, where malicious JavaScript embedded in filenames can execute in the user's browser. The problem affects numerous upload endpoints. The vendor fixed this issue in version 2.0.0.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of the uploading user's browser, which could lead to low-impact issues such as UI manipulation or minor user confusion. According to the CVSS score of 3.1 (low severity), the impact on confidentiality, integrity, and availability is limited.
Mitigation Recommendations
The vulnerability is fixed in Stirling-PDF version 2.0.0. Users should upgrade to version 2.0.0 or later to remediate this issue. Since the vendor advisory or patch links are not explicitly provided, confirm the upgrade from the official vendor source before deployment. No additional mitigation is indicated.
CVE-2026-33436: CWE-20: Improper Input Validation in Stirling-Tools Stirling-PDF
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.
CVSS v3.1
Score 3.1low
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Stirling-PDF, a locally hosted web application for PDF file operations, improperly validates input by rendering user-supplied filenames directly into HTML without sanitization. This leads to a reflected XSS vulnerability in versions before 2.0.0, where malicious JavaScript embedded in filenames can execute in the user's browser. The problem affects numerous upload endpoints. The vendor fixed this issue in version 2.0.0.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of the uploading user's browser, which could lead to low-impact issues such as UI manipulation or minor user confusion. According to the CVSS score of 3.1 (low severity), the impact on confidentiality, integrity, and availability is limited.
Mitigation Recommendations
The vulnerability is fixed in Stirling-PDF version 2.0.0. Users should upgrade to version 2.0.0 or later to remediate this issue. Since the vendor advisory or patch links are not explicitly provided, confirm the upgrade from the official vendor source before deployment. No additional mitigation is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-19T18:45:22.436Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e29db8bdfbbecc598ee1b5
Added to database: 4/17/2026, 8:53:12 PM
Last enriched: 4/25/2026, 2:50:12 AM
Last updated: 6/1/2026, 12:21:32 PM
Views: 71
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