Deeply understanding the open-source LMS codebase to find vulnerabilities | CVE-2021-43558, [Camilo]: Vulnerabilities can be chained together to achieve remote code execution, [Moodle]: Vulnerabilities may lead to the takeover of the site/platform. Using a large codebase means it's not practical to check every file. We must carefully filter out less important code and focus on potentially vulnerable code. @Xiaonil