# CVE-2026-82191

## Summary

- **CVE ID:** CVE-2026-82191
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (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
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 15, 2026

## Description

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.

## Affected Products

- j2commerce.com — J2Store extension for Joomla (1.0.0-3.3.22)
- j2commerce.com — J2Store extension for Joomla (4.0.0-4.0.22)
- j2commerce.com — J2Store extension for Joomla (4.1.0-4.1.7)

## References

- [CNA](https://www.j2commerce.com/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 18.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._