MantisBT is an open source bug tracker. Due to insufficient access-level checks on the Wiki redirection page, any user can reveal private Projects' names, by accessing wiki.php with sequentially incremented IDs. This issue has been addressed in commit `65c44883f` which has been included in release `2.258`. Users are advised to upgrade. Users unable to upgrade should disable wiki integration ( `$g_wiki_enable = OFF;`).
https://mantisbt.org/bugs/view.php?id=32981
https://github.com/mantisbt/mantisbt/security/advisories/GHSA-v642-mh27-8j6m
https://github.com/mantisbt/mantisbt/commit/65c44883f9d24f3ccef066fb523c93d8fdd7afc1