Zoom's support page confirms that all users must upgrade to version 5.0+ from May 30 'in order to join any meeting' as GCM encryption will be fully enabled for all Zoom meetings. I have been using zoom for a long time but I was on the basic pla. At the same time my account was upgraded and my card was charged 114. There was a meeting being held without my knowledge.

If you have not updated your desktop or mobile client, you will have the choice to update or join via a browser. Hi, my account had unusual activity a couple of weeks back. Once this is enabled for your account, all users are required to be on Zoom 5.0 or higher to join a meeting. This will be deployed as a rolling update over the release window. We will be enabling GCM encryption across the entire Zoom platform, providing increased protection for meeting data. Whilst not as good as end-to-end encryption, GCM, or (Galois/Counter Mode) is a higher-quality security system, perfect for video conferencing, because it uses a stream cipher, rather than a block cipher. The update is a really welcome boost to Zoom's security, which was found to be lacking following the app's meteoric rise thanks to the COVID-19 pandemic. Zoom announced that it would begin enabling GCM encryption on May 30, at 01:00 PDT. Popular video-conferencing app Zoom has announced that users must update their desktop client after this weekend in order to continue joining meetings, as it rolls out GCM encryption for all Zoom meetings.

Zoom update