This security update said to be from Phantom but no, it is from hackers. Not even a security update but instead they are NFTs that will introduce malware into your wallet to compromise and steal from it.
"Failing to do so, may result in loss of funds due to hackers exploiting the Solana network. Visit www.updatePhantom.com to get the latest security update."
Read in details: Fake Solana Phantom security updates push crypto-stealing malware
To risky to be seen by newbies since this kind of updates schemes used by hackers is kinda convincing since for sure when they see that they update just to think that there wallet should be updated to get more better experience for using the wallet. For seeing this always good to ask the support about some certain steps to be made so that we can verify is the said updates is truly legitimate.