On 20 August 2026, Microsoft disclosed CVE-2026-69836 — an Entra ID (formerly Azure AD) flaw with the maximum CVSS 10.0. It’s an unsafe deserialization of untrusted data (CWE-502) enabling unauthenticated remote code execution at the core of Microsoft’s cloud-identity backbone — no account, and no victim interaction required.
Two clarifications so you neither panic nor shrug. First: there’s no patch for you to apply — Microsoft remediated it in its cloud, no customer action is required, and the CVE was issued for transparency. Second: the bulletin initially flagged it as exploited, but Microsoft retracted that — there’s no confirmed exploitation. The bug was found by Microsoft engineer Robert Fitzpatrick.
Why “nothing to patch” isn’t “nothing to do”
Entra ID is the front door to everything: SSO, Microsoft 365, Azure, thousands of SaaS apps. A flaw of this class in a provider-managed service exposes a governance gap: you depend entirely on the vendor, with no version to check and no exploitation log of your own. That changes your threat model, it doesn’t cancel it. What’s actually worth doing:
- Review standing access. A provider fix doesn’t revoke already-issued tokens or undo abuse. Hunt for unusual sign-ins, new app registrations, altered service-principal permissions, and anomalous OAuth consents.
- Conditional Access and MFA resilience. Strong access policies reduce the value of any single identity compromise.
- Monitor for token-abuse and deserialization signals in Entra sign-in / audit logs; wire them into your SIEM.
- Assume-breach for identity. Treat identity as its own perimeter and test it regularly.
What to do
Cloud identity is now the primary perimeter and deserves the same scrutiny as your network. A targeted Azure AD / Entra ID security assessment, Azure penetration testing, and an assumed-breach assessment show how far a foothold in identity could reach. Get in touch and we’ll review your Entra and cloud posture.
Sources: Microsoft MSRC security bulletin; The Hacker News, Help Net Security, The Register, Cybersecurity Dive.