ViewVC is a browser interface for CVS and Subversion version control repositories. In versions 1.1.0 through 1.1.31 and 1.2.0 through 1.2.3, the standalone.py script provided in the ViewVC distribution can expose the contents of the host server's filesystem though a directory traversal-style attack. This is fixed in versions 1.1.31 and 1.2.4.
https://github.com/viewvc/viewvc/security/advisories/GHSA-rv3m-76rj-q397
https://github.com/viewvc/viewvc/issues/211
https://github.com/viewvc/viewvc/commit/5d7c76be07b77dce4ff631e9b866056344f11e84
https://github.com/viewvc/viewvc/commit/1dd84542c39b39e4a3f434db84a8ba3441d6a1e7