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Microsoft Entra ID Flaw (CVSS 10.0) Exploited in Wild, Allows Remote Code Execution
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- DeepHorus
Microsoft has disclosed a critical security vulnerability in its Entra ID cloud identity service that carries the highest possible severity rating of 10.0 on the CVSS scale. The flaw, identified as CVE-2026-69836, enables remote code execution and has already been actively exploited in the wild. This represents a significant threat, as it allows an unauthorized attacker to execute code over a network by deserializing untrusted data within the service.
Entra ID, formerly known as Azure Active Directory, is Microsoft's central platform for identity and access management. The vulnerability resides in how the service processes data, converting user-controlled information back into an active object without sufficient validation. Such flaws are particularly dangerous as they can lead to full system compromise, denial-of-service, or bypass of access controls.
Microsoft credited Principal Security Engineer Robert Fitzpatrick for discovering and reporting the critical issue. In its advisory, the company stated that the vulnerability has already been fully mitigated on its servers. Crucially, no customer action is required, as the fix has been applied centrally by Microsoft.
The company has not yet provided specific details on the exploitation campaigns. There is no public information on when the attacks began, how widespread they were, or the specific threat actors involved. The lack of incident details leaves the exact impact on potential targets unclear.
This incident follows closely on the heels of another zero-day exploit patched earlier in the month. Microsoft recently addressed a high-severity privilege escalation flaw (CVE-2026-68820) in a Windows driver, which was actively used by the North Korea-linked Lazarus Group. That campaign was part of a long-running operation dubbed "Operation Dream Job."
The rapid mitigation of CVE-2026-69836 highlights Microsoft's proactive security response for its cloud services. However, the exploitation of such a severe flaw underscores the persistent targeting of identity infrastructure by threat actors. Organizations relying on Entra ID are advised to monitor their security logs for any anomalous activity, despite the automated patch. Future vigilance will be key as adversaries continue to seek footholds in critical authentication systems.
