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🔥 This vulnerability is being actively exploited in the wild (CISA Known Exploited Vulnerabilities catalog)

CVE-2026-69836: Microsoft Entra ID Deserialization of Untrusted Data Vulnerability

criticalvulnerability🔥 Actively Exploited

security

Source: CISA Known Exploited VulnerabilitiesAugust 20, 2026CVE-2026-69836

Summary

Microsoft Entra ID (formerly called Azure Active Directory, which manages user identities and access) has a deserialization of untrusted data vulnerability (a flaw where the software unsafely processes data from untrusted sources, allowing attackers to run malicious code). An attacker could exploit this over a network to execute code without authorization, and this vulnerability is currently being exploited by real attackers.

Solution / Mitigation

Apply mitigations according to Microsoft's vendor instructions while following CISA's BOD 26-04 (Prioritizing Security Updates Based on Risk) guidance. For cloud services, follow BOD 26-04 guidance for cloud environments, or discontinue use of the product if mitigations are unavailable. Organizations must evaluate their systems' internet exposure and ensure they meet BOD 26-04 patching requirements by the due date of 2026-08-24.