An Israeli app used by then-U.S. National Security Adviser Mike Waltz to archive chats on Signal was easily hacked and his messages accessed by a hacker, new reporting reveals, compounding security issues raised by the Trump administration’s use of the private messaging platform to discuss sensitive military business.

Independent news outlet 404 Media reported on Sunday that the hacker was able to access direct messages and group chats that Waltz archived using an app created by Israeli company TeleMessage, as well as data like emails and phone numbers that Waltz and other high-level cabinet officials used on Signal.

The hacker was also able to access usernames and passwords used by customers on TeleMessage and information on which agencies and companies may be using the app. This reportedly includes personal information of Customs and Border Patrol officials and intelligence officials for the Washington, D.C. police force, according to screenshots seen by 404 Media.

The hacker was able to access the information with ease; they said that they were able to hack into TeleMessage’s servers after just 15 to 20 minutes of work, and that “it wasn’t much effort at all” to get in.

Smarsh, which owns TeleMessage,

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