Zoom's Linux client reads everything written to the X11 clipboard, not just what you paste into it
Simon Tatham (347 points on Hacker News)·medium signal
Simon Tatham posted on 12 September that the Linux Zoom client proactively requests the contents of the X11 clipboard on every selection change rather than waiting for a paste, meaning any text selected anywhere on the desktop is pulled into Zoom's process. The post hit 347 points on Hacker News. X11's clipboard model gives any client that asks the current selection, so the only real mitigations are Wayland or not running the native client.