---
id: CVE-2026-103671
title: >-
  External control of assumed-Immutable web parameter issue exists in EC-CUBE
  plugin (for EC-CUBE 4 series) "AmazonPay Plugin"
summary: >-
  External control of assumed-Immutable web parameter issue exists in EC-CUBE
  plugin (for EC-CUBE 4 series) "AmazonPay Plugin". If exploited, the user may
  be redirected to an arbitrary website during the ordering process. As a
  result, user…
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N'
cwe:
  - CWE-472
vendor: 'EC-CUBE CO.,LTD.'
product: AmazonPay V2 Plugin (4.0/4.1 series)
affected:
  - amazonpay_v2_plugin_4.0_4.1_series >= v1.1.7 <= v1.1.12
  - amazonpay_v2_plugin_4.0_4.1_series >= v1.0.0 <= v1.1.6
  - amazonpay_v2_plugin_4.2_4.3_series_bundle_edition v4.3.1
  - amazonpay_v2_plugin_4.2_4.3_series >= v4.2.3 <= v4.3.1
  - amazonpay_v2_plugin_4.2_4.3_series >= v4.2.0 <= v4.2.2
  - amazonpay_plugin_4.0_series <= v1.3.0
published: '2026-10-14'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T20:39:32.067'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103671'
references:
  - url: 'https://jvn.jp/en/jp/JVN43511918/'
    label: vultures@jpcert.or.jp
  - url: 'https://www.ec-cube.net/news/detail.php?news_id=490'
    label: vultures@jpcert.or.jp
tags:
  - nvd
  - cve.org
epss: 0.00241
epssPercentile: 0.15217
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-14T14:15:14.055640Z'
ingestedAt: '2026-10-14T09:24:26.062Z'
---

## Overview

External control of assumed-Immutable web parameter issue exists in EC-CUBE plugin (for EC-CUBE 4 series) "AmazonPay Plugin". If exploited, the user may be redirected to an arbitrary website during the ordering process. As a result, user's account information may be obtained.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.