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CVE-2026-75949 – Arbitrary File Upload/Deletion via Path Traversal – J-BusinessDirectory Joomla Exte

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Summary

CVE-2026-75949 is a critical path traversal vulnerability in the J-BusinessDirectory extension for Joomla, developed by cmsjunkie.com. The flaw resides in the extension’s file upload and removal functionality, allowing unauthenticated, unauthenticated attackers to write or delete arbitrary files on the server. The issue carries a maximum CVSS score of 10.0 (CRITICAL).

Technical details

  • Root cause: The upload/remove functionality accepted a client-controlled path/root parameter (referred to as _path_type) that could point at either the component’s site or admin directory trees, without enforcing that the resulting path stayed contained within the intended directory.
  • Trigger conditions: The affected functions also used a weak file extension check, allowing dangerous file types to be uploaded, and lacked CSRF token protection, meaning requests could potentially be forged.
  • Attack vector: Network-based; no authentication or user interaction is required to exploit the vulnerability (per the CVSS vector).
  • Impact: Combined, these flaws permit arbitrary file upload (potentially leading to remote code execution) and arbitrary file deletion, with high impact to confidentiality, integrity, and availability.

Affected software

  • J-BusinessDirectory for Joomla, versions 1.0.0 through 6.2.2 (inclusive).
  • Fixed in version 6.2.3 and later.

Severity

  • CVSS v4.0 Base Score: 10.0 (CRITICAL)
  • Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Mitigation and recommended actions

  • Immediate: Upgrade J-BusinessDirectory to version 6.2.3 or later, which addresses the path validation, file extension checking, and CSRF protection issues.
  • If immediate patching is not possible: Restrict or disable public access to the extension’s upload/remove functionality at the web server or WAF layer, and monitor for unexpected file writes/deletions within the Joomla site and admin directory trees until the patch can be applied.

References

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