# AI-Powered Attacks Expose Blockchain, API Firms > Source: > Published: 2026-11-03 18:54:42+00:00 Blockchain firm Chainstack revealed that a third-party vulnerability allowed an external attacker to breach its infrastructure, starting with a development environment on October 26, 2026, and escalating to production areas before being swiftly shut down five days later. The attacker accessed sensitive customer account data and credentials, highlighting the urgent need for robust blockchain and API security measures.