2011 MegaFon — 8K SMS messages exposed
Data compromised
SMS messages, phone numbers
Technical writeup
~8,000 customers' SMS messages with phone numbers and dates became publicly accessible, indexed by Yandex. MegaFon blamed technical glitch with external website administrator; robots.txt misconfiguration. Fined 30,000 rubles.
Root cause
Misconfiguration; robots.txt removed