The ChaoticOnyx/OnyxForum repository before 2022-05-04 on GitHub allows absolute path traversal because the Flask send_file function is used unsafely.
https://github.com/github/securitylab/issues/669#issuecomment-1117265726
https://github.com/ChaoticOnyx/OnyxForum/commit/f25543dfc62a9694d7e4f67eebfa45e3de916053