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Vulnerabilities

Vulnerability · CVE-2026-103671

External control of assumed-Immutable web parameter issue exists in EC-CUBE plugin (for EC-CUBE 4 series) "AmazonPay Plugin".

Published Oct 14, 2026 · catalog updated Oct 14, 2026 · EC-CUBE CO.,LTD. AmazonPay V2 Plugin

Patch now

CVE-2026-103671 is in the CISA known-exploited catalog. Confirm EC-CUBE CO.,LTD. AmazonPay V2 Plugin against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Medium5.3
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
0.22%
Remediation
Remediation guidance
Affected products
vendor EC-CUBE CO.,LTD. AmazonPay V2 Plugin

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor EC-CUBE CO.,LTD. AmazonPay V2 Pluginversion unspecified

How to fix CVE-2026-103671

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-103671 is in the CISA known-exploited catalog. Confirm EC-CUBE CO.,LTD. AmazonPay V2 Plugin against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-472. EPSS 0.22%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 14, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  2. Oct 14, 2026 · NIST NVD

    Detected

    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.

  3. Oct 14, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-103671

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-103671

    30-day exploitation probability 0.2%

    first.org
  • Japan JVNGovernment advisoryCVE-2026-103671

    JVN#43511918: EC-CUBE plugin (for EC-CUBE 4 series) "AmazonPay Plugin" vulnerable to external control of assumed-immutable web parameter

    jvn.jp
  • NIST NVDVulnerability recordCVE-2026-103671

    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.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2026-103671

    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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.