Currently 1Password offer no end-to-end authentication between devices where 1Password is installed. The obvious risk is that Agilebits (or someone who compromised Agilebits or its infrastructure) can have access to all data contained in vaults by simply doing a good old man-in-the-middle attack that will go unnoticed by the user.
This has been discussed and confirmed here:
Agilebits said they would address this:
This security limitation means that 1Password is not fit for corporate environments where sensitive passwords/data are shared between devices.
Other competitors like RememBear (and I think also Bitwarden) have addressed this specific issue.
I'm starting this topic to discuss this issue openly.
Chime if you think this is important!
1Password Version: all
Extension Version: Not Provided
OS Version: Not Provided
Sync Type: Not Provided