ADFORM , a European advertising technology company, experienced a significant security breach on July 27, 2026, where attackers replaced legitimate advertising scripts with malicious code targeting cryptocurrency transactions. This script aimed to intercept Bitcoin, Ethereum, and TRON transactions by modifying clipboard contents to redirect user funds to the attackers' wallets. The breach illustrates a supply chain attack, as the victimized websites were not directly compromised.
While Adform claims to have contained the situation and notified affected clients, key details about the breach, such as how it occurred and the scale of the impact, remain unknown. Users are advised to clear their browser caches and verify their cryptocurrency transaction histories from that time.