I was checking today the release page for the Admin Toolbar module and see an orange tag with the text Insecure I tried to find an explanation about it without luck, anyone knows what this means?
It's a tag that is automatically added when a more recent release for the same branch has been tagged as release that fixes security issues. In the case of the 3.0.1 release, it's the 3.0.2 release.
The Security update tag is manually added from the Security Team, and it cannot be removed once added. (Actually, the release type cannot be anymore changed, once Security update is selected.)