---
id: CVE-2026-82191
title: >-
  Joomla Extension - j2commerce.com - Unescaped request data reflected into
  PayPal notify redirect in J2Store 1.0.0-3.3.2, 4.0.0-4.0.22, 4.1.0-4.1.7 - A
  crafted link to the paypal notify endpoint, if followed by a victim's browser
  (or an a…
summary: >-
  Joomla Extension - j2commerce.com - Unescaped request data reflected into
  PayPal notify redirect in J2Store 1.0.0-3.3.2, 4.0.0-4.0.22, 4.1.0-4.1.7 - A
  crafted link to the paypal notify endpoint, if followed by a victim's browser
  (or an a…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-1241
vendor: j2commerce.com
product: J2Store extension for Joomla
affected:
  - j2store_extension_for_joomla 1.0.0-3.3.22
  - j2store_extension_for_joomla 4.0.0-4.0.22
  - j2store_extension_for_joomla 4.1.0-4.1.7
published: '2026-09-15'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:28:06.713'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82191'
references:
  - url: 'https://www.j2commerce.com/'
    label: security@joomla.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-15T19:29:07.410580Z'
cvssSource: cna
ingestedAt: '2026-09-15T19:42:58.811Z'
epss: 0.00264
epssPercentile: 0.18603
---

## Overview

Joomla Extension - j2commerce.com - Unescaped request data reflected into PayPal notify redirect in J2Store 1.0.0-3.3.2, 4.0.0-4.0.22, 4.1.0-4.1.7 - A crafted link to the paypal notify endpoint, if followed by a victim's browser (or an automated system that fetches it), causes the resulting redirect to `com_j2store`'s checkout controller to carry attacker-chosen query parameters instead of only the intended `view=checkout&task=confirmPayment&orderpayment_type=...&paction=process` set — parameter injection/smuggling into that follow-up request. This requires a victim to load the crafted link (`UI:R`/`UI:P`); it does not by itself grant an unauthenticated attacker anything they could not already obtain by requesting the target `com_j2store` URL directly with their own parameters.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.