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CVE-2026-78000— Joomla Extension - j2commerce.com - Open redirect in cart controller in J2Store 1.0.0-3.3.20, 4.0.0-4.0.20, 4.1.0-4.1.5

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 插件 - j2commerce.com - J2Store 1.0.0-3.3.21、4.0.0-4.0.21 和 4.1.0-4.1.6 中，通过 、 和 参数触发反射型跨站脚本（XSS）。四个任务处理程序接受来自用户输入的 Base64 编码 URL，并在未验证目标主机名的情况下直接重定向，从而允许攻击者利用该商店受信任的域名进行钓鱼攻击。此漏洞无需身份验证即可利用。

CVSS 5.3 · Medium EPSS 0.31% · P24

Possible ATT&CK Techniques 1 AI

T1565 · Data Manipulation

Affected Version Matrix 3

VendorProduct Version RangeStatus
j2commerce.com J2Store extension for Joomla 1.0.0-3.3.21 affected
4.0.0-4.0.21 affected
4.1.0-4.1.6 affected
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I. Basic Information for CVE-2026-78000

Vulnerability Information
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Vulnerability Title
Joomla Extension - j2commerce.com - Open redirect in cart controller in J2Store 1.0.0-3.3.20, 4.0.0-4.0.20, 4.1.0-4.1.5
Source: CVE Program / CVE List V5
Vulnerability Description
Joomla Extension - j2commerce.com - Reflected XSS via `filter_tag`, `pricefrom` and `priceto` in J2Store 1.0.0-3.3.21, 4.0.0-4.0.21, 4.1.0-4.1.6 - Four task handlers accepted a base64-encoded URL from user input and redirected to it without validating the destination host, enabling phishing using the shop's trusted domain. No authentication required.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
j2commerce.com J2Store extension for Joomla 1.0.0-3.3.21 -

II. Public POCs for CVE-2026-78000

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III. Intelligence Information for CVE-2026-78000

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Vendor Pages for CVE-2026-78000 (1)

Same Patch Batch · j2commerce.com · 2026-09-03 · 5 CVEs total

CVE-2026-78069 9.5 CRITICAL Joomla Extension - j2commerce.com - Missing authorization on Apps controller delegation ch
CVE-2026-78064 8.8 HIGH Joomla Extension - j2commerce.com - Anonymous cart-record tampering via inherited FOF `sav
CVE-2026-77999 8.7 HIGH Joomla Extension - j2commerce.com - Unauthenticated PayPal callback forgery leading to ord
CVE-2026-78065 7.1 HIGH Joomla Extension - j2commerce.com - Guest checkout address disclosure to any authenticated

IV. Related Vulnerabilities

Same product: J2Store extension for Joomla
Same vendor: j2commerce.com
Same weakness: CWE-79

V. Comments for CVE-2026-78000

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