# CVE-2026-82191: J2Store PayPal parameter injection in redirect

Source: https://junglewise.ai/threats/cve-2026-82191-j2store-paypal-parameter-injection-in-redirect  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-15. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-82191 · Severity: info · CVSS 2.7 · Published 2026-09-15

J2Store is a popular Joomla extension that turns a Joomla website into an online store with payment processing. A vulnerability in the PayPal payment notification handler allows an attacker to craft a malicious link that, when clicked by a customer or loaded by an automated system, injects attacker-chosen parameters into the checkout confirmation page. While this does not directly expose data or compromise accounts on its own, it could be chained with other techniques to manipulate the checkout flow or mislead users.

Technologies: [J2commerce.Com J2Store](https://junglewise.ai/threats/technologies/j2store). Vendors: [J2commerce.Com](https://junglewise.ai/threats/vendors/j2commerce-com).

## Quick answers

**Is CVE-2026-82191 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-82191 being exploited in the wild.

**How severe is CVE-2026-82191?** Informational severity, with a CVSS score of 2.7, published 15 September 2026.

**Which products and versions are affected?** J2commerce.Com J2Store 1.0.0–3.3.2, 4.0.0–4.0.22, 4.1.0–4.1.7.

**Is there a fix for CVE-2026-82191?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-82191 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-82191?** Check whether you run J2commerce.Com J2Store at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a parameter injection/smuggling flaw in the PayPal notify endpoint of J2Store's checkout controller. Unescaped request data from a crafted link is reflected into a redirect response, allowing an attacker to inject arbitrary query parameters into the follow-up checkout confirmation request. The attack requires social engineering (convincing a user to click the malicious link), and the injected parameters are limited to what the checkout controller already accepts. The vulnerability affects J2Store versions 1.0.0–3.3.2, 4.0.0–4.0.22, and 4.1.0–4.1.7. No active exploitation in the wild has been reported.

## Affected products

- j2commerce.com J2Store 1.0.0–3.3.2, 4.0.0–4.0.22, 4.1.0–4.1.7

## Timeline

- 2026-09-15: disclosed

## References

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

## Related threats

- [J2Store order status manipulation via unauthenticated request](https://junglewise.ai/threats/cve-2026-82189-j2store-order-status-manipulation-via-unauthenticated-request)
- [J2Store SQL injection in storefront product list](https://junglewise.ai/threats/cve-2026-81567-j2store-sql-injection-in-storefront-product-list)
- [J2Commerce J2Store missing CSRF protection in checkout controllers](https://junglewise.ai/threats/cve-2026-78081-j2commerce-j2store-missing-csrf-protection-in-checkout)
- [J2Store missing authorization in Apps controller](https://junglewise.ai/threats/cve-2026-78069-j2store-missing-authorization-in-apps-controller)
- [J2Store guest checkout address disclosure via IDOR](https://junglewise.ai/threats/cve-2026-78065-j2store-guest-checkout-address-disclosure-via-idor)