GitLab CE/EE <=19.1.7/19.2.5/19.3.1 - Arbitrary File Read

GitLab CE/EE contains an unauthenticated arbitrary file read. Workhorse, the reverse proxy in front of Rails, matches upload routes using EscapedPath and path.Clean without decoding percent sequences, while Puma decodes them before routing to Grape. Appending a trailing slash to commits or...