Unrated severityNVD Advisory· Published Jul 24, 2026· Updated Aug 3, 2026
Microsoft Exchange Online Tampering Vulnerability
CVE-2026-56191
Description
Improper authentication in Microsoft Exchange Online allows an unauthorized attacker to perform tampering over a network.
Affected products
1Patches
Vulnerability mechanics
References
1- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56191mitrevendor-advisorypatch
News mentions
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