CVE-2026-55006 — HIGH (7.8)

Q: What is CVE-2026-55006?

CVE-2026-55006 is a vulnerability with a CVSS score of 7.8 (HIGH). Insufficient granularity of access control in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.

Q: How severe is CVE-2026-55006?

CVE-2026-55006 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-55006?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Exchange Server, Microsoft Exchange Server Subscription Edition.

Vulnerability Description

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

CVSS Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Microsoft	Exchange Server	2016
Microsoft	Exchange Server Subscription Edition	< 15.02.2562.045

Related Weaknesses (CWE)

CWE-1220

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55006Vendor Advisory

FAQ

What is CVE-2026-55006?

CVE-2026-55006 is a vulnerability with a CVSS score of 7.8 (HIGH). Insufficient granularity of access control in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.

How severe is CVE-2026-55006?

CVE-2026-55006 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-55006?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Exchange Server, Microsoft Exchange Server Subscription Edition.