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CVE-2026-76597 – Unauthenticated Arbitrary File Upload – Fabrik Joomla Extension (1.0.0–4.7.1)

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Summary

CVE-2026-76597 is an unauthenticated arbitrary file upload vulnerability in the Fabrik extension for Joomla, affecting the list email plugin controller. The flaw allows an unauthenticated attacker to upload files directly to the web root, and it has been assigned a CVSS score of 8.7 (High).

Technical details

  • Root cause: the list email plugin controller in Fabrik fails to enforce proper access control (CWE-284) before accepting uploaded files.
  • Trigger condition: an unauthenticated request to the affected list email plugin endpoint can place files into the webroot without any authentication or authorization check.
  • Attack vector: Network — no privileges required and no user interaction needed.
  • Impact: high integrity impact via placement of attacker-controlled files on the webroot, which can be leveraged for further compromise of the site.

Affected software

  • Fabrik extension for Joomla, versions 1.0.0 through 4.7.1

Severity

  • CVSS v4.0 Base Score: 8.7 (High)
  • Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade Fabrik to version 4.7.2 or later, which fixes this vulnerability.
  • If patching is not immediately possible, restrict or disable access to the list email plugin’s upload functionality and monitor the webroot for unexpected new files.

References

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