It's appears to be from https://distrowatch.com/dwres.php?resource=major
Linux Mint does not adhere to the principles of software freedom and it does not publish security advisories.
I am, however, unsure why the author claims that mint does not adhere to the "principles of software freedom". Maybe because,
Mint's reputation for ease of use has been further enhanced by the inclusion of proprietary and patent-encumbered multimedia codecs that are often absent from larger distributions due to potential legal threats.