CVE-2020-1961: 
Java vulnerability analysis and mitigation

A Server-Side Template Injection vulnerability was discovered in Apache Syncope's Mail templates (CVE-2020-1961). The vulnerability affects Apache Syncope versions 2.0.X prior to 2.0.15 and 2.1.X prior to 2.1.6. This security flaw enables attackers to inject arbitrary JEXL expressions, which could lead to Remote Code Execution (RCE) (Apache Security, OSS Security).

The vulnerability is classified as a Server-Side Template Injection (SSTI) issue that specifically affects the mail template functionality in Apache Syncope. The flaw allows attackers to inject and execute arbitrary JEXL (Java Expression Language) expressions, which can result in Remote Code Execution capabilities (NVD).

The vulnerability is rated as Important in severity. If successfully exploited, attackers can execute arbitrary code remotely on the affected system through the injection of malicious JEXL expressions in mail templates (Apache Security).

The vulnerability requires access to the mail template functionality of Apache Syncope. When exploited, it allows attackers to inject and execute arbitrary JEXL expressions, leading to Remote Code Execution capabilities (OSS Security).

Users of affected versions are strongly advised to upgrade to the patched versions. Specifically, users of 2.0.X should upgrade to version 2.0.15, while users of 2.1.X should upgrade to version 2.1.6 (Apache Security).