CVE-2021-20743

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-06-22 · updated 2026-06-17
Weakness: CWE-79

Description

Cross-site scripting vulnerability in EC-CUBE Email newsletters management plugin (for EC-CUBE 3.0 series) versions prior to version 1.0.4 allows a remote attacker to inject an arbitrary script by leading a user to a specially crafted page and to perform a specific operation.

Affected products

EC-CUBE CO.,LTD. EC-CUBE Email newsletters management plugin (for EC-CUBE 3.0 series): before 1.0.4 — fixed in 1.0.4

How to fix

Upgrade to a fixed version: EC-CUBE CO.,LTD. EC-CUBE Email newsletters management plugin (for EC-CUBE 3.0 series) 1.0.4. Check the vendor advisory for mitigations.

References

https://jvn.jp/en/jp/JVN57524494/index.html
https://www.ec-cube.net/products/detail.php?product_id=960
https://jvn.jp/en/jp/JVN57524494/index.html
https://www.ec-cube.net/products/detail.php?product_id=960

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