Russian Hackers Exploit Microsoft OWA Flaw to Keep Mailbox Access After Credential Rotation

A Russian hacking group is using a 'half-click' exploit against a vulnerability (CVE-2026-42897) in Microsoft's Outlook Web Access. The attack installs a new implant, OWAReaper, which gives them persistent access to mailboxes even after passwords are changed, targeting government and corporate entities in the US and Europe.

This Wire brief sits within Fusion42's coverage of Cybersecurity.