CVE-2026-55006
Microsoft Exchange Server Elevation of Privilege Vulnerability
Insufficient granularity of access control in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Exchange Server Elevation of Privilege Vulnerability
Insufficient granularity of access control in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
- Record
CVE-2026-55006- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-1220
- Updated
- 2026-11-02
EUVDEUVD-2026-44025
Insufficient granularity of access control in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
- Record
EUVD-2026-44025- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-hxvf-rh49-68gj
Insufficient granularity of access control in Microsoft Exchange Server allows an authorized...
Insufficient granularity of access control in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
- Record
GHSA-hxvf-rh49-68gj- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-1220
- Updated
- 2026-11-02
NVD
Insufficient granularity of access control in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
- Record
CVE-2026-55006- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-1220
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-55006 is a high vulnerability (CVSS 7.8) in Microsoft Exchange Server, published July 14, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.30%, the 22nd percentile. No source names a fixed version.