Microsoft sounds alarm as perfect-10 Entra ID flaw comes under attack
- ID
- 16472
- Status
- summarized
- Published
- 21 Aug 2026, 6:15 PM
- Fetched
- 21 Aug 2026, 11:39 PM
- Provider
- The Register
- Category
- technology
- Original URL
- https://www.theregister.com/cyber-crime/2026/08/21/microsoft-sounds-alarm-as-perfect-10-entra-id-flaw-comes-under-attack/5290925
- Source URL
- https://www.theregister.com/headlines.atom
Summary
- Score
- 4.5
- Created
- 21 Aug 2026, 11:39 PM
- Tags
- Audience
- developersSaaS/startup founders
What happened
Microsoft has fixed a maximum-severity CVSS 10.0 vulnerability (CVE-2026-69836) in Entra ID, formerly Azure Active Directory, which was actively exploited in the wild. The flaw stemmed from unsafe deserialization, allowing unauthenticated remote code execution, but Microsoft has already mitigated it on their cloud infrastructure, requiring no customer patches.
Why it matters
Since Microsoft has already patched the service, you do not need to deploy updates, but if your SaaS or infrastructure relies on Entra ID for authentication, you should review your tenant logs for anomalous activity prior to the fix given the flaw allowed unauthenticated remote code execution.
Discussion angle
The security trade-offs of relying on a single cloud provider for identity management when a perfect-10 flaw is exploited silently and you must trust the vendor's mitigation without knowing the attack details.