CVE-2026-33437 Stirling PDF: Stored XSS in Info Summary
Attackers can execute stored cross-site scripting via malicious PDF metadata in Stirling PDF, potentially accessing session data or modifying page content.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-33437?
CVE-2026-33437 is a high-severity cross-site scripting vulnerability in Stirling-Tools Stirling-PDF, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Stirling-PDF is a locally hosted web application that facilitates various operations on PDF files. Prior to 2.0.0, the Get Info workflow in app/core/src/main/resources/templates/security/get-info-on-pdf.html inserts untrusted PDF Title and Author metadata into the summary-text element with innerHTML, allowing a malicious PDF to execute stored cross-site scripting when a user clicks Get Info and to access browser-session data or modify page content. This issue is fixed in version 2.0.0.
Weakness: CWE-79
Which versions are affected by CVE-2026-33437?
How do I fix CVE-2026-33437?
No fix has been published for CVE-2026-33437 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-33437 being exploited?
There is no known exploitation of CVE-2026-33437 in the wild and no public exploit code.
Sources
Also known as GHSA-qc47-qgh9-xj63.