[Japanese]

JVNDB-2026-000150

EC-CUBE plugin (for EC-CUBE 4 series) "AmazonPay Plugin" vulnerable to external control of assumed-immutable web parameter

Overview

EC-CUBE plugin (for EC-CUBE 4 series) "AmazonPay Plugin provided by EC-CUBE CO.,LTD. contains the following vulnerability.
  • External Control of Assumed-Immutable Web Parameter (CWE-472) - CVE-2026-103671
The developer states that attacks exploiting the vulnerability has been observed.

EC-CUBE CO.,LTD. reported this vulnerability to JPCERT/CC to notify users of its solution through JVN. JPCERT/CC and EC-CUBE CO.,LTD. coordinated under the Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 4.7 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Changed
  • Confidentiality Impact: None
  • Integrity Impact: Low
  • Availability Impact: None
CVSS v4 Severity
Base Metrics: 5.3 (Medium) [IPA Score]
  • Access Vector (AV): Network
  • Attack Complexity (AC): Low
  • Attack Requirements (AT): None
  • Privileges Required (PR): None
  • User Interaction (UI): Passive
    • Vulnerable System Impact
  • Confidentiality Impact (VC): None
  • Integrity Impact (VI): None
  • Availability Impact (VA): None
    • Subsequent System Impact
  • Confidentiality Impact (SC): None
  • Integrity Impact (SI): Low
  • Availability Impact (SA): None
Affected Products


EC-CUBE CO.,LTD.
  • AmazonPay V2 Plugin (4.0/4.1 series) v1.1.7 to v1.1.12
  • AmazonPay V2 Plugin (4.0/4.1 series) v1.0.0 to v1.1.6
  • AmazonPay V2 Plugin (4.2/4.3 series) v4.3.1 (Bundle Edition)
  • AmazonPay V2 Plugin (4.2/4.3 series) v4.2.3 to v4.3.1
  • AmazonPay V2 Plugin (4.2/4.3 series) v4.2.0 to v4.2.2
  • AmazonPay Plugin v1.3.0 and earlier (4.0 series)

Impact

The user may be redirected to an arbitrary website during the ordering process. As a result, user's account information may be obtained.
Solution

[Apply the Patch]
Apply the patch according to the information provided by the developer.
Vendor Information

EC-CUBE CO.,LTD.
CWE (What is CWE?)

  1. No Mapping(CWE-Other) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2026-103671
References

  1. JVN : JVN#43511918
Revision History

  • [2026/10/14]
      Web page was published

Date Public2026/10/14
Date First Published2026/10/14
Date Last Updated2026/10/14