Critical Microsoft Entra ID vulnerability exploited in the wild (CVE-2026-69836)

Source: Help Net Security

Author: Sinisa Markovic

URL: https://www.helpnetsecurity.com/2026/08/21/microsoft-entra-id-vulnerability-cve-2026-69836/

ONE SENTENCE SUMMARY:

Microsoft mitigated a critical, exploited Entra ID deserialization flaw enabling unauthenticated remote code execution, requiring no customer action.

MAIN POINTS:

1. Microsoft patched a critical remote code execution issue in Entra ID.
2. The vulnerability is tracked as CVE-2026-69836 with CVSS 10.0 severity.
3. Entra ID is Microsoft’s cloud identity platform formerly called Azure Active Directory.
4. It governs authentication and access for Microsoft 365, Azure, and third-party apps.
5. Microsoft reports the flaw was exploited in the wild.
6. Robert Fitzpatrick, a Microsoft Principal Security Engineer, discovered the vulnerability.
7. The root cause is deserialization of untrusted data.
8. Exploitation enables unauthorized code execution over a network without authentication.
9. Microsoft fully mitigated the issue on its side, requiring no administrator changes.
10. Details on attackers, timeline, impact, and post-exploitation actions were not disclosed.

TAKEAWAYS:

1. Cloud identity services can present high-impact attack surfaces when deserialization is unsafe.
2. Exploited-in-the-wild vulnerabilities demand rapid vendor-side mitigation and customer awareness.
3. Maximum-severity CVSS scores can apply even when customers cannot directly patch.
4. Limited disclosure leaves organizations needing enhanced monitoring for Entra ID-related anomalies.
5. Transparency CVEs can document fixed cloud issues despite no required tenant actions.