Some recipients of the Monad airdrop have reported not receiving their tokens due to a potential security breach. Users are advised to verify the wallet address linked on the airdrop claim page to ensure it matches their expectations. Reports suggest that a hacker may have altered wallet addresses, redirecting airdrops to unauthorized accounts. A white hat hacker previously identified a vulnerability allowing session hijacking on the Monad claim page, enabling address changes without further confirmation. It is unclear if this vulnerability affected all users, but Monad is urged to investigate the address change logs to identify any unauthorized modifications.