Rocket.Chat has fixed a server-side path traversal vulnerability that may be abused to write files to attacker-controlled locations: https://github.com/RocketChat/Rocket.Chat/commit/f5c7d94bffb279d7a2f859773935fb5cf70c81cd Exploitation of this vulnerability requires uploading attachments with crafted names and requesting a data download. No release of Rocket.Chat contains these fixes. Users should consider cherrypicking f5c7d94bffb279d7a2f859773935fb5cf70c81cd to patch their Rocket.Chat installation.