CZ Urges iPhone Users to Update iOS Amid Dark Sword Threat Binance co-founder Changpeng Zhao (CZ) has warned iPhone users to update their iOS to protect against the DarkSword exploit, which can steal crypto wallet information through compromised websites. The exploit can target sensitive data without requiring wallet connections or transaction confirmations, raising concerns about self-custodial security. Although Apple has patched known vulnerabilities, researchers note that parts of the exploit are still reusable, highlighting ongoing risks for crypto holders.