On March 29, 2022, VMware disclosed a critical vulnerability within the Spring Java framework, known as "Spring4Shell" or "SpringShell," officially tracked as CVE-2022-22965, which allows for full remote code execution (RCE) through class injection. This zero-day vulnerability, found in Spring Core's "data binding" mechanism, has raised significant concerns over potential malicious attacks on applications using the library, as it can be exploited via specially crafted HTTP requests. Comparisons have been drawn to the infamous Log4Shell vulnerability due to Spring Core's widespread use. Logz.io provides its Cloud SIEM customers with out-of-the-box detection rules to identify possible Spring4Shell exploitation by scanning for webshell activity in access logs, allowing for real-time monitoring and protection against attackers. The vulnerability's ease of exploitation in production environments necessitates heightened awareness and security measures, such as those offered by Logz.io's Cloud-based SIEM with a free 14-day trial available for new users.