CVE-2026-78065
Received Received - Intake

Guest Checkout Address Disclosure in J2Store Extension

Publication date: 2026-09-03

Last updated on: 2026-09-03

Assigner: Joomla! Project

Description
Joomla Extension - j2commerce.com - Guest checkout address disclosure to any authenticated user (IDOR) in J2Store 1.0.0-3.3.21, 4.0.0-4.0.21, 4.1.0-4.1.6 - `editAddress()` redirected non-owners away only when the loaded address row had a **non-empty** `user_id` belonging to someone else. Guest-checkout address rows have an empty `user_id`, so that check never triggered for them — any logged-in account guessing a small, sequential `address_id` got a guest customer's full name, street address, and phone number rendered prefilled into the edit form.

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Meta Information

Published
2026-09-03
Last Modified
2026-09-03
Generated
2026-09-03
AI Q&A
2026-09-03
EPSS Evaluated
N/A
NVD
CVE-2026-78065
EUVD
EUVD-2026-70444

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
j2store j2store From 1.0.0 (inc) to 3.3.21 (inc)
j2store j2store From 4.0.0 (inc) to 4.0.21 (inc)
j2store j2store From 4.1.0 (inc) to 4.1.6 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

Attack-Flow Graph

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Executive Summary

This vulnerability is an Insecure Direct Object Reference (IDOR) in the J2Store Joomla extension versions 1.0.0-3.3.21, 4.0.0-4.0.21, and 4.1.0-4.1.6. It allows any authenticated user to view guest checkout addresses by guessing sequential address IDs. Guest addresses have an empty user_id field, bypassing ownership checks in the editAddress() function.

Impact Analysis

An attacker could exploit this to access sensitive customer data such as full names, street addresses, and phone numbers of other users. This could lead to privacy breaches, identity theft, or targeted phishing attacks against customers.

Compliance Impact

This vulnerability likely violates GDPR due to unauthorized access to personal data and potential failure to protect user information. It may also breach HIPAA if customer addresses or phone numbers are considered protected health information.

Mitigation Strategies

Update J2Store to the latest patched version (3.3.22 or later for 3.x, 4.0.22 or later for 4.0.x, 4.1.7 or later for 4.1.x). If immediate update is not possible, disable guest checkout functionality in J2Store settings until patched.

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