🛡️ CVE-2026-33436 — 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.
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.
Weakness class
CVE-2026-33436 is classified as CWE-20: Improper Input Validation. The application accepts input without checking that it has the expected form, so malformed values reach code that assumes they are well formed.
Affected software
CVE-2026-33436 is recorded against 2 packages.
- stirling-pdf (fixed in 2.0.0)
- unknown
Timeline and source
Published on 17 April 2026 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.
References
Details
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| stirling-pdf | — | 2.0.0 |
| unknown | — | — |
References
Similar Threats
- Medium CVE-2026-41580
- Medium CVE-2026-33438
- Medium CVE-2026-34071
- High CVE-2026-27625
- High CVE-2025-55150
Exploit Protection
Are you running stirling-pdf?
CVE-2026-33436 carries CVSS 3.1 Low rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.
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