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Microsoft warns of Exchange zero-day flaw exploited in attacks

·Source: BleepingComputer

Updated:

Executive Summary

On Thursday, Microsoft shared mitigations for a high-severity Exchange Server vulnerability exploited in attacks that allow threat actors to execute arbitrary code via cross-site scripting (XSS) while targeting Outlook on the web users. [...]

Analysis

On Thursday, Microsoft shared mitigations for a high-severity Exchange Server vulnerability exploited in attacks that allow threat actors to execute arbitrary code via cross-site scripting (XSS) while targeting Outlook on the web users. [...]
Source Attribution

Originally published by BleepingComputer on May 15, 2026.

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