spring-web: (re)creating the temporary storage directory could result in a privilege escalation within WebFlux application

In Spring Framework, versions 5.2.x prior to 5.2.15 and versions 5.3.x prior to 5.3.7, a WebFlux application is vulnerable to a privilege escalation: by recreating the temporary storage directory, a locally authenticated malicious user can read or modify files that have been uploaded to the WebFl...