
SBI's 2026 PII Leak: How a Small Breach Feeds India's Multi-Million-Record Underground Data Market
In October 2026, the State Bank of India (SBI) disclosed a customer data breach after a threat actor operating under the alias 'Siriusim' published 3,897 customer records—along with a table of 375,000 rows and 2,722 PDF files—on BreachForums. The exposed PII included names, mobile numbers, email addresses, dates of birth, home addresses, KYC documentation, Central KYC numbers, video KYC verification data, loan application metadata, and employment declarations. SBI confirmed the incident via a formal notice to India's National Stock Exchange, while stressing that core banking operations remained unaffected. The breach is suspected to have originated from a peripheral data-handling or digital-services system rather than SBI's core banking platform. This incident underscores the compounding risk that even small PII leaks create within India's mature underground data economy, where threat actors cross-reference breach dumps with real-time lookup services to build high-fidelity identity profiles for phishing, vishing, loan fraud, and impersonation attacks—amplifying the harm far beyond the raw record count.
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