CVE-2026-82191 Open redirect in J2Store extension for Joomla
Attackers can craft links that redirect victims to a checkout controller with injected parameters, potentially bypassing intended flow restrictions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-82191?
CVE-2026-82191 is a medium-severity vulnerability in j2commerce.com J2Store extension for Joomla, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-1241
Which versions are affected by CVE-2026-82191?
How do I fix CVE-2026-82191?
No fix has been published for CVE-2026-82191 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-82191 being exploited?
There is no known exploitation of CVE-2026-82191 in the wild and no public exploit code.
Sources
Also known as GHSA-hv62-7458-mg3v.