What is CVE-2026-33437?

CVE-2026-33437 is a high-severity vulnerability in Stirling-Tools Stirling-Pdf, classified under Cross-site Scripting. CVSS score: 8.1/10. Published 2026-08-17.

How severe is CVE-2026-33437?

High severity. CVSS v3 base score is 8.1 out of 10.

XSS in Stirling-Tools Stirling-Pdf

CVE-2026-33437

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.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

Affected products

Stirling-tools Stirling-pdf — versions < 2.0.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-33437?: CVE-2026-33437 is a high-severity vulnerability in Stirling-Tools Stirling-Pdf, classified under Cross-site Scripting. CVSS score: 8.1/10. Published 2026-08-17.
How severe is CVE-2026-33437?: High severity. CVSS v3 base score is 8.1 out of 10.