Daniel Gultsch wrote:

“Please update to Con­ver­sa­tions 2.1.4 ASAP. Avail­able on both Google Play and F-​Droid. This fixes our first crit­ical secur­ity issue. More details will fol­low after the major­ity of people have upgraded. Con­ver­sa­tions Leg­acy and Con­ver­sa­tions prior to 2.0 are not affected.”