Weekly briefing

Week 38 · 15 Sep – 21 Sep 2025 UTC · assess the changes, then plan the next dates.

What to assess first

15 Sep – 21 Sep · dates to 21 Oct Check coverage

Act on1

19Sep
Exploited19 Sep 2025
Edge 140.0.3485.81: fixes CVE-2025-10585, exploited in the wild
Microsoft Edge security release notes
Related evidence (6)
- Edge 140.0.3485.66: Chromium security fixes
  Public source · Same source page; the statements may concern different changes
- Edge 140.0.3485.54: Chromium security fixes and 1 Edge-specific fix
  Public source · Same source page; the statements may concern different changes
- Edge 139.0.3405.125: Chromium security fixes
  Public source · Same source page; the statements may concern different changes
- Edge 139.0.3405.111: Chromium security fixes
  Public source · Same source page; the statements may concern different changes
- Edge 139.0.3405.102: Chromium security fixes
  Public source · Same source page; the statements may concern different changes
- Edge 139.0.3405.86: Chromium security fixes
  Public source · Same source page; the statements may concern different changes

Coming up8

26Sep
Message Center action dateDue 26 Sep 2025
MC1142625: Retirement of Microsoft Places team guidance featureMicrosoft 365 Message Center Archive by Merill Fernando
3Oct
Message Center action dateDue 3 Oct 2025
MC1164380: Microsoft 365 Copilot: Information about billing plan setup for Microsoft 365 Copilot ChatMicrosoft 365 Message Center Archive by Merill Fernando
6Oct
Message Center action dateDue 6 Oct 2025
MC1148534: Retirement of Outlook Lite appMicrosoft 365 Message Center Archive by Merill Fernando
12Oct
Message Center action dateDue 12 Oct 2025
MC1166851: Access to Non-Native Viva Engage Network Ending October 13 2025Microsoft 365 Message Center Archive by Merill Fernando
13Oct
Message Center action dateDue 13 Oct 2025
MC1154299: Reminder - Support for Office 2016, Office 2019, and additional apps will end on October 14, 2025Microsoft 365 Message Center Archive by Merill Fernando
Same day: Message Center action date: MC910978: Support for Office 2016 and Office 2019 will end October 14, 2025: Upgrade recommended
14Oct
Patch TuesdayScheduled for 14 Oct 2025
Patch Tuesday, 14 October 2025
The second Tuesday of the month, when Microsoft releases security updates for Windows, Office, and servers.
14Oct
Message Center action dateDue 14 Oct 2025
MC1058303: Reminder: Support for the Word Mobile, Excel Mobile, and PowerPoint Mobile UWP applications will end on October 14, 2025Microsoft 365 Message Center Archive by Merill Fernando
20Oct
Message Center action dateDue 20 Oct 2025
MC1135479: [Action Required] Credential management requires additional MFA Prompt for enhanced securityMicrosoft 365 Message Center Archive by Merill Fernando

Changed2

15Sep
Security15 Sep 2025
WAF - WAF Release - 2025-09-15
Cloudflare WAF changelog
19Sep
Revised19 Sep 2025
MC1150123: Teams Admin Center: Control External Access by Domain for Specific Users and GroupsMicrosoft 365 Message Center Archive by Merill Fernando
Microsoft Teams

How this list is chosen

Changes from 15 Sep 2025 – 21 Sep 2025 UTC and dates due up to 21 Oct 2025. 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.