Microsoft fixes Exchange sign-ins broken by October Windows Server updates
November Patch Tuesday updates KB5131080 and KB5131090 lift an Endpoint Mapper memory cap on Server 2019 and later.
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Stories tagged #exchange-server
Microsoft says October Windows updates can break on-premises Exchange email
Four October 13 Windows Server updates can stall mail and webmail; Microsoft says do not uninstall them.
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Week in review: FortiBleed is still active, Patch Tuesday forecast
CISA added an exploited NetScaler flaw to KEV as Atlassian, Exchange, and SonicWall patches landed amid active attacks.
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CVE-2026-96940: Microsoft Fixes Exchange Server Flaw For Which Exploitation Is More Likely
Microsoft patched CVE-2026-96940, which lets authenticated attackers read other Exchange mailboxes in the same organization.
Microsoft security advisory (AV26-1001)
Canada's Cyber Centre urges patches for Exchange elevation-of-privilege flaw CVE-2026-96940.
Out-of-band Exchange Server update fixes high-severity mailbox access bug (CVE-2026-96940)
Microsoft issued an out-of-band Exchange update for CVE-2026-96940, a same-organization mailbox read flaw.
Microsoft Releases Emergency Exchange Server Update to Fix CVE-2026-96940
Microsoft issued a revised September 2026 Exchange Server update (V2) adding a fix for CVE-2026-96940 across Exchange SE, 2019, and 2016.
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Microsoft Pushes New Exchange V2 Update After Discovering New Security Flaw
Microsoft reissued September 2026 Exchange updates to fix CVE-2026-96940, an authenticated mailbox-access flaw scored 8.8.
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Microsoft’s Biggest Patch Tuesday: 974 CVEs, 2 Zero-Days and 20 Wormable Bugs
Microsoft's record September 2026 Patch Tuesday fixes 974 CVEs, including two exploited Windows privilege-escalation zero-days and 20 wormable bugs.
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Microsoft Exchange Vulnerability CVE-2026-62911: What Administrators Should Do and How Zscaler Can Help
High-severity authentication bypass CVE-2026-62911 in Exchange Server has public exploit code; about 22,000 servers remain unpatched and internet-exposed.
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Nearly 22,000 Microsoft Exchange servers remain exposed to critical security flaw (CVE-2026-62911)
About 22,000 Microsoft Exchange servers remain unpatched against critical auth bypass CVE-2026-62911 as a working exploit circulates online.
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