Shared from twixb · bleepingcomputer.com

Microsoft warns of Exchange zero-day flaw exploited in attacks

bleepingcomputer.com·May 15, 2026

Microsoft has released mitigations for a critical vulnerability in Exchange Server that enables attackers to execute arbitrary code through cross-site scripting (XSS) targeting Outlook on the web users.

Consider implementing Microsoft's recommended mitigations for the high-severity Exchange Server vulnerability if your organization uses Outlook on the web, as this vulnerability allows threat actors to execute arbitrary code via cross-site scripting (XSS), posing a significant risk to your network security. Prioritize these updates in your security operations to prevent potential exploitation.

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