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Description

Insufficient granularity of access control in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.

PUBLISHED Reserved 2026-06-16 | Published 2026-07-14 | Updated 2026-07-14 | Assigner microsoft




HIGH: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Problem types

CWE-1220: Insufficient Granularity of Access Control

Product status

15.01.0.0 (custom) before 15.01.2507.071
affected

15.02.0.0 (custom) before 15.02.1544.043
affected

15.02.0.0 (custom) before 15.02.1748.048
affected

15.02.0.0 (custom) before 15.02.2562.045
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55006 (Microsoft Exchange Server Elevation of Privilege Vulnerability) vendor-advisory patch

cve.org (CVE-2026-55006)

nvd.nist.gov (CVE-2026-55006)

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