AI Summary
A zero-day vulnerability, CVE-2026-42897, in Microsoft Exchange allows attackers to exploit cross-site scripting in Outlook Web Access to compromise mailboxes. No patch is currently available, posing active risk to organizations.
Technical dark reading · 5/18/2026
Microsoft Exchange Zero-Day Under Attack, No Patch Available
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Quick Answer
A zero-day vulnerability, CVE-2026-42897, in Microsoft Exchange allows attackers to exploit cross-site scripting in Outlook Web Access to compromise mailboxes. No patch is currently available, posing active risk to organizations.
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Intelligence grade actionable
dark reading
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HIGH
Importance
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