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Microsoft confirms maximum severity flaw in Entra ID targeted for exploitation

Cybersecuritydive •David Jones • August 21, 2026

The company said the remote-code execution vulnerability has been fully mitigated and no further action is necessary.

Microsoft said a critical remote-code execution vulnerability in Entra ID has been exploited in the wild.

The vulnerability, tracked as CVE-2026-69836 , is related to deserialization of untrusted data and has a severity score of 10 out of 10, the highest score possible.

In a bulletin from the Microsoft Security Response Center, Microsoft said the vulnerability has been fully mitigated and no additional action is required of customers. The company added that it disclosed the vulnerability in an effort to provide greater transparency.

Microsoft Entra ID is a cloud-based identity and access management tool. Entra ID became the new name for Azure Active Directory as part of a 2023 rebranding effort .

The company provided no additional details regarding the vulnerability, including the exploitation timeline, specific impacts on customers or details how the vulnerability was originally discovered.

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Critical CVE-2026-69836 in Microsoft Entra ID Exploited in the Wild Microsoft disclosed a critical remote code execution vulnerability in Entra ID, tracked as CVE-2026-69836, which has been actively exploited in the wild. This flaw, stemming from unsafe deserialization of untrusted data, allows unauthenticated attackers to execute code remotely. The vulnerability was published on August 20, 2026, and is rated CVSS 10.0, indicating maximum severity. Microsoft has fully mitigated the vulnerability on its servers, requiring no action from users. However, the lack of details regarding the exploitation timeline and affected tenants raises concerns among security professionals. Other critical vulnerabilities were also disclosed, including CVE-2026-65801 in Exchange Online, which allows unauthorized privilege escalation. Organizations relying on Entra ID for authentication should review access logs for any anomalies during the exploitation window. No public proof-of-concept or active exploitation was confirmed for other vulnerabilities at the time of disclosure. 45 sources 70

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Microsoft confirms maximum severity flaw in Entra ID targeted for exploitation

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