CVE-2026-40379 Azure Entra ID Spoofing Vulnerability
An unauthorized attacker can exploit sensitive information exposure in Azure Entra ID to perform network spoofing, requiring a vendor patch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-40379?
CVE-2026-40379 is a critical vulnerability in Microsoft Entra, published on 12 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Exposure of sensitive information to an unauthorized actor in Azure Entra ID allows an unauthorized attacker to perform spoofing over a network.
Weakness: CWE-200
Which versions are affected by CVE-2026-40379?
It affects 1 product.
Products include Microsoft Entra Id.
How do I fix CVE-2026-40379?
No fix has been published for CVE-2026-40379 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-40379 being exploited?
There is no known exploitation of CVE-2026-40379 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Entra
- CVE-2026-69836 Microsoft Entra ID Remote Code Execution Vulnerability
- CVE-2026-42901 Microsoft Entra ID Elevation of Privilege Vulnerability
- CVE-2026-35431 Microsoft Entra ID Entitlement Management Spoofing Vulnerability
- CVE-2025-55241 Azure Entra ID Elevation of Privilege Vulnerability
- CVE-2026-83941 Entra ID Elevation of Privilege Vulnerability
Sources
Also known as GHSA-xq38-4286-vwhm.