novaGallery is a php image gallery. Prior to version 2.1.1, a path traversal vulnerability has been identified in novaGallery. This allows unauthenticated users to read image files outside the intended gallery root directory. This issue has been patched in version 2.1.1.
https://github.com/novafacile/novagallery/security/advisories/GHSA-wv5j-98c7-frm9
https://github.com/novafacile/novagallery/releases/tag/v2.1.1
https://github.com/novafacile/novagallery/commit/46fe7b0f79f429e18c8cff3f92360c4513732ba6