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CVE-2026-82191— 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

Quick assessment

Affected
j2commerce.com J2Store extension for Joomla
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Joomla 扩展 - j2commerce.com - J2Store 1.0.0-3.3.2、4.0.0-4.0.22 和 4.1.0-4.1.7 中，PayPal 通知重定向反射了未经转义的请求数据 攻击者可以构造指向 PayPal 通知（notify）端点的恶意链接。如果受害者的浏览器（或自动抓取该链接的系统）访问了该链接，则随后跳转至 组件的结账控制器时，会携带攻击者任意指定的查询参数，而不仅仅是预期的 参数组——这实质上构成了向后续请求注入或“夹带”恶意参数的行为。 此漏洞需要受害者实际加载该恶意链接才

CVSS 5.3 · Medium

Affected Version Matrix 3

VendorProduct Version RangeStatus
j2commerce.com J2Store extension for Joomla 1.0.0-3.3.22 affected
4.0.0-4.0.22 affected
4.1.0-4.1.7 affected
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I. Basic Information for CVE-2026-82191

Vulnerability Information
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Vulnerability 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
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1241
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
j2commerce.com J2Store extension for Joomla 1.0.0-3.3.22 -

II. Public POCs for CVE-2026-82191

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III. Intelligence Information for CVE-2026-82191

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Vendor Pages for CVE-2026-82191 (1)

Same Patch Batch · j2commerce.com · 2026-09-15 · 6 CVEs total

CVE-2026-82189 8.7 HIGH Joomla Extension - j2commerce.com - Any order can be marked Failed by anyone in J2Store 1.
CVE-2026-81568 8.7 HIGH Joomla Extension - j2commerce.com - Arbitrary file read via `task=download` in J2Store 1.0
CVE-2026-81567 8.7 HIGH Joomla Extension - j2commerce.com - Unauthenticated blind SQL injection in the storefront
CVE-2026-78081 7.1 HIGH Joomla Extension - j2commerce.com - Missing CSRF protection on cart, checkout and myprofil
CVE-2026-82190 6.3 MEDIUM Joomla Extension - j2commerce.com - Predictable/forgeable order access token in J2Store 1.

IV. Related Vulnerabilities

Same product: J2Store extension for Joomla
Same vendor: j2commerce.com
Same weakness: CWE-1241

V. Comments for CVE-2026-82191

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