A new analysis of TM Signal’s source code appears to show that the app sends users’ message logs in plaintext. At least one top Trump administration official used the app.

The clone, TeleMessage, was the subject of a reported hack in which the contents of some direct messages and group chats were stolen.

An unidentified miscreant is said to have obtained US government communications from TeleMessage, a messaging and archiving app based on the open-source Signal app and used by ousted national security advisor Michael Waltz. TeleMessage, which was acquired by Oregon-based Smarsh in 2024, says it's shut the app down for now.