The gollum-grit_adapter Ruby gem dependency in gollum before 3.1.1 and the gollum-lib gem dependency in gollum-lib before 4.0.1 when the string "master" is in any of the wiki documents, allows remote authenticated users to execute arbitrary code via the -O or --open-files-in-pager flags.

The Precious module in gollum before 4.0.1 allows remote attackers to read arbitrary files by leveraging the lack of a certain temporary-file check.

Cross site scripting (XSS) in gollum 5.0 to 5.1.2 via the filename parameter to the 'New Page' dialog.