CVE-2026-42901
Microsoft Entra ID has a critical flaw that lets an attacker gain full control of the system without needing any credentials. The vulnerability is caused by an origin validation error that can be exploited over a network. It allows attackers to take over the entire environment.
No official fix yet. If none appears within 45 days of first tracking, this entry is removed automatically.
Who is affected
Microsoft Entra ID
Real-world impact
An attacker who can reach the affected system can elevate privileges to the highest level, effectively taking full control of the environment and accessing all data and services.
Why this severity
The CVSS score of 10 reflects that the flaw requires no authentication, can be exploited remotely, and gives an attacker complete compromise of confidentiality, integrity, and availability.
What to do about it
No official fix or mitigation is documented in the sources yet. Monitor the vendor advisory and apply the patch as soon as it is released.
No fix documented in sources
Timeline
- May 22, 2026 · May 22, 2026PublishedDisclosed and added to the National Vulnerability Database.
- Jul 23, 2026 · 12d agoAdvisory updatedThe NVD record was last revised.
How it’s attacked
References & advisories
- msrc.microsoft.com/update-guide/vulnerability/…vendor advisory