Description
Thymeleaf through 3.1.1.RELEASE, as used in spring-boot-admin (aka Spring Boot Admin) through 3.1.1 and other products, allows sandbox bypass via crafted HTML. This may be relevant for SSTI (Server Side Template Injection) and code execution in spring-boot-admin if MailNotifier is enabled and there is write access to environment variables via the UI.
Remediation
References
https://github.com/p1n93r/SpringBootAdmin-thymeleaf-SSTI
Related Vulnerabilities
CVE-2021-26539 Vulnerability in npm package sanitize-html
CVE-2018-17960 Vulnerability in npm package ckeditor
CVE-2019-10754 Vulnerability in maven package org.apereo.cas:cas-server-core-services-api
CVE-2020-36049 Vulnerability in maven package org.webjars.npm:socket.io-parser
CVE-2018-5673 Vulnerability in maven package org.apache.geronimo.plugins:dojo