Lithuanian data breach may expose intelligence officers’ personal details

A major data leak from Lithuania’s Centre of Registers includes sensitive information about intelligence officers, politicians, and military personnel, opposition leader Laurynas Kasčiūnas warned on Saturday, citing potential risks to national security.

The General Prosecutor’s Office is investigating the unauthorised access and theft of 600,000 registry records, with several breaches traced to a foreign state and misused institutional accounts, LRT reports.

Kasčiūnas, leader of the conservative Homeland Union party, described the incident as likely a Russian intelligence operation rather than a large-scale cybercrime. “The stolen data may include state registry details on Lithuanian intelligence officers, military personnel, individual politicians, civil servants, and other legal and natural persons,” he wrote on Facebook.

Home addresses and property records—often classified as sensitive—could enable surveillance, physical threats, or targeted cyber operations, the politician warned. Such data allows tracking daily routines, identifying social networks, or even installing technical surveillance near residences, he added.

The exposed information might also fuel blackmail, financial pressure, or indirect access to targets through neighbours or service providers, Kasčiūnas said. He raised concerns that detailed profiles of officials could be published online as so-called “blacklists.”

The Centre of Registers confirmed the breach involved real estate registry extracts, including personal identification numbers, but denied exposure of contact details, payment records, or legal documents. Prosecutors have not disclosed the foreign state involved or the institutions whose credentials were compromised.