Cryptocurrency exchange Bithumb has alerted its users in South Korea following a significant data breach by SK Telecom, the nation’s largest mobile carrier. Concerns about potential risks to user accounts have prompted Bithumb to strengthen security measures and heighten monitoring efforts. Bithumb is currently investigating for any suspicious activity and implementing additional safeguards. The exchange also urged users to take immediate action to secure their accounts. SK Telecom confirmed the data leak, attributing it to malicious software, and took swift measures to remove the malware and isolate devices suspected of being hacked. While no misuse of the leaked information has been reported, SK Telecom is deploying preventive measures including system investigations, blocking illegal SIM swaps, and enhanced authentication controls to mitigate further risk.