Decoded: SMB Cybersecurity

Piranha CMS Cross-site Scripting (XSS) Vulnerability via File Upload

Published Date: December 21, 2024

Package Affected Versions Patched Versions Severity
📦 Piranha (NuGet) <= 11.1.0 Moderate

Description

Vulnerability Details


A cross-site scripting (XSS) vulnerability exists in Piranha CMS version 11.1 and earlier, caused by improper validation of uploaded PDF files.

How It Happens:



  1. An authenticated attacker uploads a malicious PDF via /manager/media.

  2. The PDF contains embedded JavaScript code.

  3. When another user opens or interacts with the PDF in their browser, the malicious script executes.

Patches & Workarounds

Potential Fix or Mitigation:



  1. Validate File Uploads: Ensure uploaded PDFs are strictly validated to prevent embedded JavaScript.

  2. Disable Inline PDF Rendering: Serve PDFs as downloads instead of rendering them directly in the browser.

  3. Content Security Policy (CSP): Implement a CSP to restrict JavaScript execution from uploaded files.

  4. Access Control: Restrict media upload permissions to trusted users only.

  5. Monitor for Updates: Keep an eye on official patches from the Piranha CMS team.


Until an official fix arrives, these steps can minimize exposure. If you think skipping them is fine, just remember: PDFs aren’t always as innocent as they look.

References

https://nvd.nist.gov/vuln/detail/CVE-2024-55342

https://github.com/PiranhaCMS/piranha.core

https://sec-fortress.github.io/posts/articles/posts/CVE-2024-55342.html
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