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Weekly briefing

Week 51 · 15 Dec – 21 Dec 2025 UTC · assess the changes, then plan the next dates.

What to assess first

15 Dec – 21 Dec · dates to 20 Jan Check coverage

Act on3

  1. Exploited17 Dec 2025

    Cisco Multiple Products Improper Input Validation Vulnerability

    CVE-2025-20393

  2. Exploited16 Dec 2025

    Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability

    CVE-2025-59718

  3. Exploited15 Dec 2025

    Apple Multiple Products Use-After-Free WebKit Vulnerability

    CVE-2025-43529

Coming up8

  1. CISA KEV deadlineDue 30 Dec 2025

    Microsoft Windows Use After Free Vulnerability

    CVE-2025-62221

    Same day: Message Center action date: MC1126353: Retirement of Search-MailboxAuditLog and New-MailboxAuditLogSearch Cmdlets by End of 2025

  2. Message Center action dateDue 31 Dec 2025

    MC1166868: Microsoft Teams: Retirement of UKG and Blue Yonder managed connectors for ShiftsMicrosoft 365 Message Center Archive by Merill Fernando

  3. Message Center action dateDue 4 Jan 2026

    MC1163756: Outlook for Android will require Android 10.0 or higher starting January 2026Microsoft 365 Message Center Archive by Merill Fernando

  4. Message Center action dateDue 7 Jan 2026

    MC1193408: (Update)Action Required: Trust DigiCert Global Root G2 Certificate Authority for using Entra services by January 7, 2026Microsoft 365 Message Center Archive by Merill Fernando

  5. Message Center action dateDue 11 Jan 2026

    MC1187397: Microsoft Defender for Endpoint: Threat actor attribution information will be removed from alert pageMicrosoft 365 Message Center Archive by Merill Fernando

  6. Message Center action dateDue 12 Jan 2026

    MC1164375: Retirement of "When Sending a Message" Group Policy in Classic Outlook for WindowsMicrosoft 365 Message Center Archive by Merill Fernando

  7. Patch TuesdayScheduled for 13 Jan 2026

    Patch Tuesday, 13 January 2026

    The second Tuesday of the month, when Microsoft releases security updates for Windows, Office, and servers.

  8. End of supportDue 13 Jan 2026

    End of support: 3 products

    Advanced Threat Analytics 1.X; Dynamics CRM 2016 (Dynamics 365); Visual Studio 2022 , Version 17.10 (LTSC channel)

    Same day: Message Center action date: MC1186368: Microsoft SharePoint: Update to custom scripting governance in App Catalog site

Changed1

  1. Security18 Dec 2025

    WAF - WAF Release - 2025-12-18

    Cloudflare WAF changelog

How this list is chosen

Changes from 15 Dec 2025 – 21 Dec 2025 UTC and dates due up to 20 Jan 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.

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 27 Oct 18:49 UTC · 272 of 272 readable · 270 fully read · documentation 469/469 current

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