CVE-2021-20842: 
PHP vulnerability analysis and mitigation

CVE-2021-20842 is a Cross-site Request Forgery (CSRF) vulnerability discovered in EC-CUBE 2 series versions 2.11.0 to 2.17.1. The vulnerability was disclosed on November 11, 2021, affecting the management screen of the EC-CUBE e-commerce platform (JVN Report).

The vulnerability is classified as a Cross-site Request Forgery (CSRF) issue with a CVSS v3.0 Base Score of 6.5 (Medium severity). The attack vector is characterized as Network (AV:N), with Low attack complexity (AC:L), requiring No privileges (PR:N), and User interaction (UI:R). The scope is Unchanged (S:U), with High impact on integrity (I:H) but No impact on confidentiality and availability (JVN Report).

If exploited, the vulnerability allows an attacker to delete administrator accounts when a user with administrative privileges views a malicious page while logged into the system. This could potentially disrupt system administration capabilities (JVN Report).

The vulnerability has been fixed in EC-CUBE version 2.17.2. Users are advised to update to this version or later. For those unable to update immediately, the developer has provided hotfix patches that can be applied to affected versions (JVN Report).