Trezor's Third-Party Email Provider Breach Exposes 347,000 Users to Cryptocurrency Phishing Campaign
In September 2026, cryptocurrency hardware wallet manufacturer Trezor disclosed a sophisticated phishing campaign targeting 347,000 users following a breach of their third-party email provider Brevo. Threat actors compromised Brevo's systems and sent convincing phishing emails claiming a critical hardware vulnerability in Trezor devices, tricking 2,500 users into clicking malicious links before the campaign was shut down within 20 minutes. This incident represents Trezor's third major security breach in recent years, following previous compromises of their support portal and shipping provider. This attack demonstrates the evolving sophistication of supply chain targeting, where attackers compromise trusted third-party service providers to reach high-value cryptocurrency users with credible social engineering tactics.
Kill Chain
