Off-by-one error in the convert_query_hexchar function in html.c in cgit.cgi in cgit before 0.8.3.5 allows remote attackers to cause a denial of service (infinite loop) via a string composed of a % (percent) character followed by invalid hex characters, as demonstrated by a %gg sequence.

Cross-site scripting (XSS) vulnerability in the print_fileinfo function in ui-diff.c in cgit 0.9.0.2 and earlier allows remote authenticated users to inject arbitrary web script or HTML via the filename associated with the rename hint.

Heap-based buffer overflow in the substr function in parsing.c in cgit 0.9.0.3 and earlier allows remote authenticated users to cause a denial of service (crash) and possibly execute arbitrary code via an empty username in the "Author" field in a commit.

Argument injection vulnerability in syntax-highlighting.sh in cgit 9.0.3 and earlier allows remote authenticated users with permissions to add files to execute arbitrary commands via the --plug-in argument to the highlight command.

Directory traversal vulnerability in the cgit_parse_readme function in ui-summary.c in cgit before 0.9.2, when a readme file is set to a filesystem path, allows remote attackers to read arbitrary files via a .. (dot dot) in the url parameter.