CVE-2026-62912 Microsoft Exchange Server Denial of Service Vulnerability
An authorized attacker can cause a denial of service in Microsoft Exchange Server via deserialization of untrusted data.
- 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-2026-62912?
CVE-2026-62912 is a medium-severity unsafe deserialization vulnerability in Microsoft Exchange Server, published on 11 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to deny service over a network.
Weakness: CWE-502
Which versions are affected by CVE-2026-62912?
It affects 2 products.
Products include Microsoft Exchange Server, Microsoft Exchange Server Subscription Edition.
How do I fix CVE-2026-62912?
No fix has been published for CVE-2026-62912 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-62912 being exploited?
There is no known exploitation of CVE-2026-62912 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-97wg-gxw5-r3h4.