CVE-2026-78064
Received Received - Intake

Anonymous Cart-Record Tampering in J2Store

Publication date: 2026-09-03

Last updated on: 2026-09-03

Assigner: Joomla! Project

Description
Joomla Extension - j2commerce.com - Anonymous cart-record tampering via inherited FOF `save` task in J2Store 1.0.0-3.3.21, 4.0.0-4.0.21, 4.1.0-4.1.6 - `fof.xml` grants the `carts` view's tasks a wildcard `true` ACL, and FOF only enforces CSRF tokens on back-end HTML requests, not on front-end `format=raw` requests. `J2StoreControllerCarts` already scoped `remove()` to the caller's own session, but never overrode the generic FOF `save` task, so it remained reachable to insert new cart rows with an attacker-chosen `user_id`/`session_id`, or overwrite an existing row by id.

CVSS Scores

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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-2026-78064
EUVD
EUVD-2026-70414

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
j2store j2store 1.0.0
j2store j2store 3.3.21
j2store j2store to 4.0.21 (inc)
j2store j2store 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 allows an attacker to tamper with anonymous cart records in J2Store versions 1.0.0-3.3.21, 4.0.0-4.0.21, and 4.1.0-4.1.6. The issue stems from a flaw in the FOF framework where the `save` task in the `carts` view has a wildcard ACL set to true, bypassing proper access controls. Attackers can exploit this to insert new cart entries with arbitrary user or session IDs or overwrite existing entries by ID.

Impact Analysis

This vulnerability could allow attackers to manipulate cart data, potentially leading to unauthorized purchases, price changes, or session hijacking. Users might experience incorrect billing, loss of purchased items, or fraudulent transactions. The high CVSS score (8.8) indicates significant risk of exploitation.

Mitigation Strategies

Update J2Store to the latest patched version immediately to address the anonymous cart-record tampering vulnerability. Disable front-end raw format requests if not required and ensure CSRF tokens are enforced on all requests. Review and restrict ACL permissions for the carts view in fo f.xml to prevent unauthorized access.

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