CVE-2026-55006 Microsoft Exchange Server Elevation of Privilege Vulnerability
An authorized attacker can elevate privileges locally due to insufficient access control granularity in Microsoft Exchange Server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-55006?
CVE-2026-55006 is a high-severity vulnerability in Microsoft Exchange Server, published on 14 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Insufficient granularity of access control in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
Weakness: CWE-1220
Which versions are affected by CVE-2026-55006?
It affects 2 products.
Products include Microsoft Exchange Server, Microsoft Exchange Server Subscription Edition.
How do I fix CVE-2026-55006?
No fix has been published for CVE-2026-55006 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-55006 being exploited?
There is no known exploitation of CVE-2026-55006 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Exchange Server
- CVE-2024-21410 Microsoft Exchange Server Privilege Escalation
- CVE-2021-34473 Microsoft Exchange Server Remote Code Execution
- CVE-2021-26855 Microsoft Exchange Server Remote Code Execution
- CVE-2021-34523 Microsoft Exchange Server Privilege Escalation
- CVE-2023-21529 Microsoft Exchange Server Deserialization of Untrusted Data
Sources
Also known as GHSA-hxvf-rh49-68gj.