CVE-2026-69355 Microsoft Exchange Server Remote Code Execution Vulnerability
An authorized attacker can execute arbitrary code on Microsoft Exchange Server via path traversal vulnerabilities.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-69355?
CVE-2026-69355 is a high-severity path traversal vulnerability in Microsoft Exchange Server, published on 8 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
External control of file name or path in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
Weakness: CWE-73
Which versions are affected by CVE-2026-69355?
It affects 2 products.
Products include Microsoft Exchange Server, Microsoft Exchange Server Subscription Edition.
How do I fix CVE-2026-69355?
No fix has been published for CVE-2026-69355 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-69355 being exploited?
There is no known exploitation of CVE-2026-69355 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-q6cf-r5wm-3jxw.