CVE-2026-34071 Stirling-PDF has Stored Cross Site Scripting (XSS) via EML-to-HTML Export
Attackers can execute JavaScript in victim browsers by sending malicious emails that trigger unsanitized HTML export in Stirling-PDF.
- 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-2026-34071?
CVE-2026-34071 is a medium-severity cross-site scripting vulnerability in Stirling-Tools Stirling-PDF, published on 26 Mar 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 allows you to perform various operations on PDF files. In version 2.7.3, the /api/v1/convert/eml/pdf endpoint with parameter downloadHtml=true returns unsanitized HTML from the email body with Content-Type: text/html. An attacker who sends a malicious email to a Stirling-PDF user can achieve JavaScript execution when that user exports the email using the "Download HTML intermediate file" feature. Version 2.8.0 fixes the issue.
Weakness: CWE-79
Which versions are affected by CVE-2026-34071?
It affects 1 product.
Products include Stirling Stirling Pdf.
How do I fix CVE-2026-34071?
No fix has been published for CVE-2026-34071 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-2026-34071 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34071 exists.
Other vulnerabilities in Stirling-Tools Stirling-PDF
Sources
Also known as GHSA-xmhg-fv84-jgfc.