Outage in Cyderes

Microsoft 365 Outage and Degradation - Impacting Defender Portal Access

Resolved Minor

January 23, 2026 - Started 3 months ago - Lasted about 15 hours
Official incident page

Incident Report

Microsoft is experiencing a widespread Microsoft 365 outage that is affecting access to Microsoft Defender portals and related security services. Defender EDR is functioning on endpoints, Cyderes is receiving alerts via our connectors, but the cloud portals and backend services are intermittently unavailable or degraded. This issue impacts management, visibility, and portal access currently – not the agents on endpoints. Cyderes will continue to monitor the situation closely. MSFT ref. MO1221364 in the Microsoft 365 admin center or https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect.

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Latest Updates ( sorted recent to last )

RESOLVED 3 months ago - at 01/23/2026 04:14PM

Microsoft has identified this issue as resolved. Please reference MSFT ref. MO1221364 in the Microsoft 365 admin center for further information. Direct link: https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect

MONITORING 3 months ago - at 01/23/2026 01:14AM

Microsoft is experiencing a widespread Microsoft 365 outage that is affecting access to Microsoft Defender portals and related security services. Defender EDR is functioning on endpoints, Cyderes is receiving alerts via our connectors, but the cloud portals and backend services are intermittently unavailable or degraded.

This issue impacts management, visibility, and portal access currently – not the agents on endpoints. Cyderes will continue to monitor the situation closely. MSFT ref. MO1221364 in the Microsoft 365 admin center or https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect.

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