Forbes describes it as "definitely already out there, and under active exploitation according to the U.S. Cybersecurity and Infrastructure Security Agency, urging all organizations to prioritize timely remediation as the attack vector poses a significant risk."

"We have issued CVE-2026-42897 to address a spoofing vulnerability affecting Exchange Outlook Web Access (OWA)," Microsoft told SecurityWeek. "We recommend customers enable EEMS to be better protected, and to follow our guidance available here."

Microsoft this week patched 137 vulnerabilities with its Patch Tuesday updates and the cybersecurity industry was surprised to see that the latest updates did not address any zero-days. Ho...