Cve 2026 42897

Microsoft releases CVE-2026-42897 fix for Exchange Server OWA XSS vulnerability exploited since May. ESU-only updates for 2016/2019 leave many systems exposed.

Microsoft Exchange Server zero-day CVE-2026-42897 enables session hijacking via malicious emails. Active exploitation confirmed with no permanent fix available.

Microsoft confirms active exploitation of CVE-2026-42897, an XSS flaw in Exchange OWA that executes JavaScript via malicious emails. No patch available yet.