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CVE-2026-81568 – Arbitrary File Read via Path Traversal – J2Store Joomla Extension 1.0.0–3.3.22, 4.0

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Summary

CVE-2026-81568 is a path traversal vulnerability (CWE-22) in the download functionality of the J2Store extension for Joomla. A customer in possession of a valid download token can manipulate a stored filename to read arbitrary files outside the configured attachment directory, such as configuration.php. The flaw carries a High severity rating (8.7) and requires no privileges beyond an already-issued download token.

Technical details

  • Root cause: the J2StoreModelOrderdownloads::getFilePath() method builds the path to a downloadable file by concatenating the configured attachment folder with a stored product_file_save_name value, sanitizing it only with JPath::clean() and checking existence with JFile::exists().
  • JPath::clean() normalizes directory separators but does not strip or reject ../ traversal sequences, so a crafted filename can escape the intended attachment directory.
  • Trigger conditions: the requester must hold a valid J2Store download token (issued to customers who have completed an order with a downloadable product), but no Joomla administrator privileges are required.
  • Attack vector: network — the traversal payload is submitted through the standard task=download request flow.
  • Impact: disclosure of arbitrary files readable by the web server, including sensitive configuration files (e.g., configuration.php), which can expose database credentials and other secrets and enable further compromise.

Affected software

  • J2Store extension for Joomla, versions 1.0.0 through 3.3.22
  • J2Store extension for Joomla, versions 4.0.0 through 4.0.22
  • J2Store extension for Joomla, versions 4.1.0 through 4.1.7

Severity

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

Mitigation and recommended actions

  • Immediate: at the time of publication no fixed release addressing this specific traversal issue had been confirmed by the vendor for any branch (3.x, 4.0.x, or 4.1.x). Check the J2Commerce site for a security release beyond 3.3.22 / 4.0.22 / 4.1.7 and apply it as soon as it is available.
  • If no patch is yet available: restrict or disable the J2Store download endpoint where feasible, audit issued download tokens and rotate/expire them if abuse is suspected, and ensure configuration.php and other sensitive files are not readable by the web server user beyond what is strictly required.
  • As a general hardening step, monitor web server logs for download requests containing ../ or encoded traversal sequences targeting the J2Store download task.

References

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