calibre is an e-book manager. Prior to 9.2.0, Calibre's CHM reader contains a path traversal vulnerability that allows arbitrary file writes anywhere the user has write permissions. On Windows (haven't tested on other OS's), this can lead to Remote Code Execution by writing a payload to the Startup folder, which executes on next login. This vulnerability is fixed in 9.2.0.
Exploitability
AV:LAC:LPR:NUI:RScope
S:CImpact
C:HI:HA:H8.6/CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:HInput Validation