Medium severity · published Oct 14, 2026
CVE-2026-103671
External control of assumed-Immutable web parameter issue exists in EC-CUBE plugin (for EC-CUBE 4 series) "AmazonPay Plugin"
4.7
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AP
AmazonPay Plugin (4.0 series) · EC-CUBE CO.,LTD.
through v1.3.0 · source: vendor
AV
AmazonPay V2 Plugin (4.0/4.1 series) · EC-CUBE CO.,LTD.
v1.1.7 through v1.1.12; v1.0.0 through v1.1.6 · source: vendor
AV
AmazonPay V2 Plugin (4.2/4.3 series) · EC-CUBE CO.,LTD.
v4.2.3 through v4.3.1; v4.2.0 through v4.2.2 · source: vendor
AV
AmazonPay V2 Plugin (4.2/4.3 series, Bundle Edition) · EC-CUBE CO.,LTD.
v4.3.1 · source: vendor
Affected product
AP
AmazonPay Plugin (4.0 series)
EC-CUBE CO.,LTD.