EUVD-2026-63693
GHSA-v6wh-624g-vvmv
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Unauthenticated network deserialization RCE with no user interaction gives AV:N/AC:L/PR:N/UI:N; identity-plane compromise affecting other systems justifies S:C and full C:H/I:H/A:H.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Deserialization of untrusted data in Microsoft Entra ID allows an unauthorized attacker to execute code over a network.
Articles & Coverage 2
AnalysisAI
Remote code execution in Microsoft Entra ID lets an unauthenticated network attacker run arbitrary code by submitting maliciously crafted serialized data that the service deserializes without validation (CWE-502). The CVSS 3.1 base score is a maximum 10.0 with a scope change, reflecting unauthenticated network reach and full compromise of confidentiality, integrity, and availability. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The CVSS vector is AV:N/AC:L/PR:N/UI:N, so no authentication, no user interaction, and no special client-side conditions are required - exploitation is unauthenticated and remote against a reachable Entra ID deserialization endpoint. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Every raw signal points to top-tier severity: the CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H yields a perfect 10.0, meaning low-complexity, unauthenticated, no-interaction network exploitation with full impact and scope change. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Patch available per vendor advisory: Microsoft has released a fix, and the primary action is to review and apply guidance in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69836; no exact standalone fix version is published because Entra ID is a Microsoft-operated cloud service, so much of the remediation is applied service-side by Microsoft. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify the patched version from Microsoft security advisories and initiate procurement and deployment planning. …
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Same weakness CWE-502 – Deserialization of Untrusted Data
View allSame technique Deserialization
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External POC / Exploit Code
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