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CVE-2026-67359 – Authorization Bypass / Sensitive Order Data Exposure – J2Store (Joomla) 1.0.0–3.3.2

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Summary

CVE-2026-67359 is an authorization bypass vulnerability (CWE-639, Authorization Bypass Through User-Controlled Key) in the J2Store e-commerce extension for Joomla. An unauthenticated visitor can supply an arbitrary order_id value as a query parameter to view the full checkout confirmation page of another customer’s order. The flaw carries a CVSS v4.0 base score of 8.7 (High) and requires no authentication or user interaction to exploit.

Technical details

  • Root cause: the checkout confirmation page renders order details based solely on a user-supplied order_id parameter, without verifying that the requesting visitor is authorized to view that specific order.
  • Trigger condition: an attacker only needs to change the order_id value in the request URL to a different, guessable or sequential order number.
  • Attack vector: network-based (remote, unauthenticated HTTP request), low attack complexity, no privileges or user interaction required.
  • Impact: disclosure of another customer’s order data, including line items, purchased products, prices, and order totals; no impact on integrity or availability is indicated.

Affected software

  • J2Store (Joomla extension) versions 1.0.0 through 3.3.20
  • J2Store versions 4.0.0 through 4.0.20
  • J2Store versions 4.1.0 through 4.1.5

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: no patched version is identified in the published CVE record at this time. Contact j2commerce.com / the J2Store vendor to confirm availability of a fixed release and upgrade as soon as one is published.
  • If no patch is available: restrict or monitor access to checkout/order-confirmation endpoints, enforce server-side ownership checks (e.g., via a web application firewall rule blocking anomalous order_id enumeration), and review order-related request logs for sequential or out-of-pattern order_id access patterns indicative of scanning/enumeration.

References

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