Newly discovered Russian hacking campaign targets European military and transport organizations.

Russian military-linked hackers exploited a critical flaw in Microsoft's email software to target and infiltrate the networks of European military, energy, and transportation organizations in an apparent spying campaign that went undetected for months. Microsoft discovered the cyber activity after a tip from Ukrainian officials and disclosed the vulnerability, urging customers to update their software. The hackers used a stealthy technique to steal login details and burrow further into organizations' email folders. Microsoft blamed a hacking group linked to Russia's GRU military intelligence agency, which has denied the allegations.