In March 2022, a critical remote code execution vulnerability known as "SpringShell" or "Spring4Shell" was discovered in the popular Spring Framework, specifically targeting its data binding mechanism. The vulnerability, cataloged as CVE-2022-22965, allows attackers to exploit Java's ClassLoader attributes, especially in applications running on JDK 9 or later, leading to potential arbitrary code execution. The issue impacts many web applications that use Spring, particularly those using tutorials that bind request parameters to Java objects, making them susceptible to this flaw. While it was initially likened to the notorious Log4Shell vulnerability, SpringShell is not as widespread. The vulnerability was first sensationalized in a blog post, followed by a proof-of-concept release on Twitter, leading to its confirmation and subsequent patch releases by the Spring maintainers. Despite the vulnerability's potential severity, it is limited by certain conditions, such as deployment on Apache Tomcat as a WAR file, though future exploits may target different platforms. The primary mitigation strategy involves upgrading the Spring Framework to versions 5.2.20 or 5.3.18, or implementing a workaround by restricting certain ClassLoader fields, but upgrading remains the most effective solution. Additionally, the JFrog platform offers tools to detect and remediate the vulnerability, and it clarifies that two other Spring CVEs released at the same time are unrelated to SpringShell.