CVE-2021-37634

CVE-2021-37634 describes a Cross-site Scripting (XSS) vulnerability in Leafkit, a templating language, affecting versions prior to 1.3.0. This flaw allows attackers to inject malicious scripts into generated Leaf pages if unsanitized data is passed to variable tags, potentially leading to XSS attacks without other mitigations like a Content Security Policy. The vulnerability has a CVSS score of 6.1 (Medium), indicating a network-based attack with low complexity, requiring user interaction, and resulting in low impact to confidentiality and integrity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.