The vulnerability in Secret Network went unnoticed for an entire week before being discovered. Security audits for cross-chain bridges really can't be skipped.

CryptoWorld News: Hackers reportedly stole approximately $4.67 million from Secret Network by exploiting a vulnerability. The attackers used flaws in a custom token contract to mint unsupported Axelar wrapped assets and exchanged them for real assets held in custody. The attack took place on June 10 and wasn’t discovered until June 17, remaining unnoticed throughout that period. Secret Network warned that Satokens connected to the affected Axelar may no longer be fully supported, while Axelar confirmed that its network and the IBC protocol were not impacted. This incident is one of the largest crypto security events recorded this month.