MetaMask before 10.11.3 might allow an attacker to access a user's secret recovery phrase because an input field is used for a BIP39 mnemonic, and Firefox and Chromium save such fields to disk in order to support the Restore Session feature, aka the Demonic issue.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.008
EPSS Ranking 72.5%