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Description

Improper authorization in Microsoft Exchange Online allows an unauthorized attacker to disclose information over a network.

PUBLISHED Reserved 2026-05-21 | Published 2026-06-04 | Updated 2026-06-05 | Assigner microsoft




CRITICAL: 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C

Problem types

CWE-285: Improper Authorization

Product status

-
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-48579 (Microsoft Exchange Online Information Disclosure Vulnerability) vendor-advisory patch

cve.org (CVE-2026-48579)

nvd.nist.gov (CVE-2026-48579)

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