CVE-2025-53782 Microsoft Exchange Server Elevation of Privilege Vulnerability
An attacker can elevate privileges locally due to an incorrect authentication algorithm implementation in Microsoft Exchange Server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-53782?
CVE-2025-53782 is a high-severity authentication bypass vulnerability in Microsoft Exchange Server, published on 14 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Incorrect implementation of authentication algorithm in Microsoft Exchange Server allows an unauthorized attacker to elevate privileges locally.
Weakness: CWE-303
Which versions are affected by CVE-2025-53782?
It affects 2 products.
Products include Microsoft Exchange Server, Microsoft Exchange Server Subscription Edition.
How do I fix CVE-2025-53782?
No fix has been published for CVE-2025-53782 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2025-53782 being exploited?
There is no known exploitation of CVE-2025-53782 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-2jpf-9r3f-f5p3.