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Exchange Emergency Mitigation Service

Microsoft's auto-applied URL-rewrite mitigation framework for Exchange Server, used as the sole remediation for CVE-2026-42897 with documented side effects to calendar, Light mode, and inline images.

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#415 May

Applied a URL-rewrite rule to mitigate CVE-2026-42897 with documented side effects to OWA calendar, Light mode, and inline images

Cybersecurity: Threats and Defences: Exchange repeats the CISA deadline-before-patch trap