CVE-2026-69836 -- CVSS 10.0 Vulnerability Briefing

CVE-2026-69836 | CVSS 10.0 (Critical) | Exploit: PoC available

What Is It

CVE-2026-69836 is a critical deserialization of untrusted data vulnerability in Microsoft Entra ID that may allow unauthenticated remote code execution over a network.

Technical Detail

The vulnerability results from unsafe deserialization of attacker-controlled data handled by Microsoft Entra ID. An unauthorized attacker may be able to send crafted serialized input to a vulnerable network-accessible service or interface and cause arbitrary code to execute. Successful exploitation could provide remote code execution in the security context of the affected service; affected components and attack prerequisites have not been further identified in the available information.

Exploitation Status

A proof of concept is available. This indicates that public or private demonstration exploit code exists, but active exploitation in the wild has not been confirmed. CVE-2026-69836 is not currently listed in CISA's Known Exploited Vulnerabilities catalog.

Who Is Targeting This

No specific threat actor attribution at this time.

What To Do

Treat this as an urgent patching priority because it has a CVSS score of 10.0 and may permit unauthenticated remote code execution. Apply Microsoft security updates or mitigations for affected Entra ID deployments as soon as Microsoft provides them, and review Microsoft advisories for affected services, configuration guidance, and any temporary workarounds. Restrict unnecessary network exposure to Entra ID-related management and service interfaces, monitor for anomalous requests or service failures associated with serialized data processing, and investigate unexpected child processes, code execution, or outbound network activity originating from Entra ID service infrastructure. No vendor-specific workaround or detection signature is confirmed in the available data.