Is CVE-2026-33437 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-33437 being exploited in the wild.

How severe is CVE-2026-33437?

High severity, with a CVSS score of 8.1, published 17 August 2026.

Which products and versions are affected?

Stirling-Tools Stirling-PDF <=1.1.0.

Is there a fix for CVE-2026-33437?

A patch was published on 2026-11-25: Version 2.0.0 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-33437 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-33437?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-33437: Stirling-PDF stored XSS in Get Info workflow

Q: Is there a fix for CVE-2026-33437?

A patch was published on 2026-11-25: Version 2.0.0 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-33437 attacked?

It is attacked over the network, in a web application.

Q: Am I affected by CVE-2026-33437?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-33437 · Severity: high · CVSS 8.1 · Published 2026-08-17

Stirling-PDF is a locally hosted web application that performs various operations on PDF files, including extracting and displaying file metadata. Prior to version 2.0.0, malicious PDF files with crafted Title or Author metadata can execute malicious scripts in a user's browser when the "Get Info" button is clicked, potentially allowing attackers to steal session data, access sensitive information, or modify page content.

Quick answers

Is CVE-2026-33437 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-33437 being exploited in the wild.
How severe is CVE-2026-33437?: High severity, with a CVSS score of 8.1, published 17 August 2026.
Which products and versions are affected?: Stirling-Tools Stirling-PDF <=1.1.0.
Is there a fix for CVE-2026-33437?: A patch was published on 2026-11-25: Version 2.0.0 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-33437 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-33437?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a stored cross-site scripting (XSS) flaw in the Get Info workflow (get-info-on-pdf.html) where untrusted PDF metadata fields are extracted and inserted directly into the DOM using innerHTML without sanitization. The vulnerable code concatenates user-controlled Title and Author metadata from PDF files and inserts the result into the summary-text element. An attacker can create a malicious PDF with XSS payloads in metadata fields; when a legitimate user uploads and clicks "Get Info" on such a PDF, the payload executes in their browser context. The attack requires user interaction (clicking Get Info) but no authentication or special privileges. This issue is fixed in version 2.0.0 via proper input sanitization.

Affected products

Stirling-Tools Stirling-PDF <=1.1.0

Timeline

2026-07-30: disclosed
2026-11-25: patched: Version 2.0.0 released
2026-08-17: advisory

References

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