Microsoft Patches a CVSS 10.0 Entra ID Flaw (Aug 2026): What Customers Need to Know

In August 2026, Microsoft's Patch Tuesday included fixes for several critical vulnerabilities in Microsoft Entra ID, including one rated the maximum CVSS 10.0, according to The Hacker News and SecurityWeek.

What was reported

CVE-2026-69836 (CVSS 10.0): a remote code execution vulnerability in Entra ID caused by deserialization of untrusted data, which could allow an unauthorized attacker to execute code over a network. Microsoft discovered the issue internally and fixed it server-side; customers didn't need to take action. Microsoft initially marked the vulnerability as exploited, then corrected that to indicate it had not been exploited in the wild.
CVE-2026-59115 (CVSS 9.9): a critical elevation of privilege vulnerability in the Microsoft Entra Provisioning Service.
CVE-2026-62869 (CVSS 8.8): a critical spoofing vulnerability.

What it means for customers

For cloud-only services, "no action required" is accurate for the fix itself — Microsoft patches its own infrastructure. But it doesn't answer two questions customers should still ask:

Could we have been affected before the fix? For Entra issues, look at outcomes in your tenant: unexpected privileged changes, provisioning changes, new app credentials.
What does our configuration expose? Provisioning integrations, app registrations and service principals with broad permissions increase what an identity-platform flaw could reach.

Why it matters

This followed the 2025 actor token flaw (CVE-2025-55241). Two critical cross-cutting identity platform issues within roughly a year show that identity providers are complex, high-value software — and that customer-side monitoring and least privilege remain essential even when the provider fixes things quickly.

What to do now

Review provisioning configurations (HR-driven provisioning, app provisioning, cross-tenant sync) and the permissions they hold.
Audit privileged changes in recent months.
Confirm alerting on role assignments, app credential additions and provisioning changes.
Track Microsoft advisories for Entra, including cloud-service CVEs.