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Actor Exploits Microsoft Exchange Server Vulnerabilities, Cortex XDR Blocks Harvesting of Credentials
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Chinese hackers hit thousands of organizations using Microsoft Exchange
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Hackers Actively Searching for Unpatched Microsoft Exchange Servers
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Expert publishes PoC exploit code for Microsoft Exchange flaws
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Suspected Chinese Group Calypso APT Exploiting Vulnerable Microsoft Exchange Servers
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62,000 Microsoft Exchange Servers potentially left unpatched
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CISA emergency directive urges to fix Microsoft Exchange zero
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FBI silently removed web shells planted on Microsoft Exchange servers
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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.
CVE-2026-62911 is a critical authentication bypass by capture-replay in Microsoft Exchange Server that allows an authorized attacker to elevate privileges over the network, with a CVSS score of 8.0. Microsoft patched the flaw on August 11, 2026, but Shadowserver Foundation scans show roughly 22,000 servers unpatched, with the US (6,200) and Germany (5,100) leading; BSI reports 85% of on-premises Exchange servers in Germany are still vulnerable. The Netherlands' NCSC-NL flagged that a working exploit is circulating, and Exchange 2016/2019 require the Extended Security Updates program for fixes.
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NCSC is not aware of ransomware attacks compromising UK orgs through Microsoft Exchange bugs
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ProxyLogon fixes for unsupported Microsoft Exchange versions released
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Researchers warn of a surge in cyber attacks against Microsoft Exchange
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Is there a link between Microsoft Exchange exploits and PoC code the company shared with partner security firms?
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Threat Brief: CVE-2022-41040 and CVE-2022-41082: Microsoft Exchange Server (ProxyNotShell)
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Microsoft releases IOC Detection Tool for Microsoft Exchange Server flaws
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Hackers compromised the Microsoft Exchange servers at EBA
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Microsoft Exchange Cyber Attack — What Do We Know So Far?
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