Exchange Online Mailbox Quarantine Issue
Overview Microsoft is investigating and working to resolve an ongoing Exchange Online incident (EX1436407) that has mistakenly quarantined customer mailboxes since July 19, 2026. The […]
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Exchange 2016/2019 Security Updates Stops in October
Overview Microsoft has confirmed that security updates for Exchange Server 2016 and 2019 will officially end in October 2026, marking the conclusion of the Extended […]
Microsoft Warns of Two Actively Exploited Defender Vulnerabilities
Overview Microsoft has confirmed that two Microsoft Defender vulnerabilities are being actively exploited in the wild, prompting urgent patch releases for all Windows endpoints. The flaws […]
Exchange XSS Exploit — Layer 7 Threat to Enterprise Networks
Overview CISA has issued a warning about CVE‑2026‑42897, a cross‑site scripting (XSS) vulnerability in Microsoft Exchange Server’s Outlook Web Access (OWA). Already added to the […]
Microsoft Exchange, Windows 11, and Cursor Zero‑Days Exploited on Pwn2Own Day 2
Pwn2Own Berlin 2026 is proving to be one of the most intense offensive security contests in recent memory. Day Two alone delivered 15 new zero‑day […]
On‑Prem Microsoft Exchange Server CVE‑2026‑42897 Actively Exploited
Overview Microsoft has disclosed a new vulnerability in on‑premises Exchange Server, tracked as CVE‑2026‑42897 (CVSS 8.1). The flaw, stemming from a cross‑site scripting (XSS) bug, […]
Exchange Online Migration Incident EX1280763: Stuck Sync States and Resource Errors
Overview Microsoft has announced incident EX1280763, confirming that migrations to and from Exchange Online — including tenant‑to‑tenant onboarding and offboarding — are currently failing. Admins […]
Microsoft Resolves Classic Outlook Email Delivery Bug
Microsoft has fixed a server-side issue that was preventing some Classic Outlook users from successfully sending emails via Outlook.com. The bug, first acknowledged last week, […]
Microsoft’s MX Record Change: Stronger Email Security Ahead
In July 2026, Microsoft will roll out a major change to its MX (Mail Exchange) records, the backbone of email routing. This update is designed […]
Exchange Online Outage Highlights Fragility of Microsoft 365 Infrastructure
Microsoft is working to resolve a widespread Exchange Online outage that left customers unable to access their mailboxes and calendars across multiple connection methods. The […]