Weekly briefing
Week 4 · 19 Jan – 25 Jan 2026 UTC · assess the changes, then plan the next dates.
Act on2
Coming up8
-
MC1158908: (Update)Support for Events from email in Outlook is changing—Schema.org markup required for reliable calendar extractionMicrosoft 365 Message Center Archive by Merill Fernando
Same day: Message Center action date: MC1184649: Microsoft SharePoint: Retirement of IDCRL authentication protocol and enforcement of OpenID Connect and OAuth protocols
-
Microsoft Windows Information Disclosure Vulnerability
CVE-2026-20805
-
Patch Tuesday, 10 February 2026
The second Tuesday of the month, when Microsoft releases security updates for Windows, Office, and servers.
-
MC1217649: Endpoint DLP-sensitive data alerting retiring in Defender; use Purview DLPMicrosoft 365 Message Center Archive by Merill Fernando
Same day: Message Center action date: MC1230455: Context IQ retirement in the new Outlook and Outlook on the web
-
Microsoft Office Security Feature Bypass Vulnerability
CVE-2026-21509
Changed2
-
Windows · 3 releases
Windows 11, version 24H2, Windows 11, version 25H2
-
KB5078131 · Windows 10, version 1809 +1
Windows 10, version 1809, Windows Server 2019
How this list is chosen
Changes from 19 Jan 2026 – 25 Jan 2026 UTC and dates due up to 24 Feb 2026. Dates are the source's own, or labelled as the day ChangeIntel observed a change; never inferred effective dates.
Ranked by kind: exploited vulnerabilities, then up to 7 dates, open known issues, and other notable changes, with at most one entry per feed. Service incidents are on the status board; security baseline downloads, first captures of a document, and metadata-only documentation checks are left out. This is a view of retained evidence, not a reconstruction of everything known at the time.
The briefing is selective. Browse every dated change, review upcoming dates or check the period's coverage.