Is CVE-2026-34071 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-34071 being exploited in the wild.

How severe is CVE-2026-34071?

Medium severity, with a CVSS score of 5.4, published 26 March 2026.

Which products and versions are affected?

Stirling-Tools Stirling-PDF 2.7.3.

Is there a fix for CVE-2026-34071?

A patch was published on 2026-03-26: Version 2.8.0 released to address the vulnerability Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-34071 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-34071?

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-2026-34071: Stirling-PDF stored XSS in EML-to-HTML export

CVE-2026-34071 · Severity: medium · CVSS 5.4 · Published 2026-03-26

Stirling-PDF is a self-hosted web application used for managing and converting PDF documents. A security flaw in the email-to-PDF conversion feature allows malicious code embedded in an email to execute in a user's browser if they choose to download the intermediate HTML version of the file. This could lead to unauthorized access to the user's session, data theft, or further attacks on the internal network where the application is hosted.

Quick answers

Is CVE-2026-34071 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-34071 being exploited in the wild.
How severe is CVE-2026-34071?: Medium severity, with a CVSS score of 5.4, published 26 March 2026.
Which products and versions are affected?: Stirling-Tools Stirling-PDF 2.7.3.
Is there a fix for CVE-2026-34071?: A patch was published on 2026-03-26: Version 2.8.0 released to address the vulnerability Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-34071 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-34071?: 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

A stored cross-site scripting (XSS) vulnerability exists in Stirling-PDF version 2.7.3 within the EML-to-PDF conversion logic. When the 'downloadHtml=true' parameter is used on the /api/v1/convert/eml/pdf endpoint, the application fails to apply HTML sanitization to the email body, returning raw HTML with a 'text/html' content type. While the PDF conversion path correctly utilizes a sanitizer, the HTML export path passes a null sanitizer to the processing utility. An attacker can exploit this by crafting a malicious EML file containing JavaScript; if an authenticated user processes this file and selects the "Download HTML intermediate file" option, the script will execute in their browser context upon opening the file. This issue is resolved in version 2.8.0.

Affected products

Stirling-Tools Stirling-PDF 2.7.3

Timeline

2026-03-25: advisory: GitHub Security Advisory published by maintainers
2026-03-26: disclosed: CVE-2026-34071 published to NVD
2026-03-26: patched: Version 2.8.0 released to address the vulnerability

References

https://github.com/Stirling-Tools/Stirling-PDF/security/advisories/GHSA-xmhg-fv84-jgfc

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.