EUVD-2026-70795
GHSA-w2qf-mqjq-8m33
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Network-reachable unauthenticated authZ bypass in a shared identity service justifies AV:N/AC:L/PR:N/UI:N and S:C with C:H/I:H; no availability impact so A:N.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Authorization bypass through user-controlled key in Microsoft Azure Active Directory B2C allows an unauthorized attacker to elevate privileges over a network.
AnalysisAI
Privilege elevation in Microsoft Azure Active Directory B2C lets an unauthenticated remote attacker abuse a user-controlled key (CWE-639) to bypass authorization checks and gain elevated privileges across a network. The flaw carries a maximum CVSS 10.0 with a changed scope, reflecting that a successful attack against the shared identity platform can compromise the confidentiality and integrity of resources belonging to other principals or tenants. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Per the CVSS vector (AV:N/AC:L/PR:N/UI:N), exploitation requires only network reachability to the affected Azure AD B2C endpoint, with no authentication and no user interaction against default service behavior. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N) is the theoretical worst case: network-reachable, low complexity, no privileges, no user interaction, scope change, high confidentiality and integrity impact, no availability impact - yielding the 10.0. … 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 | Because Azure AD B2C is a Microsoft-hosted cloud service, the fix is deployed server-side by Microsoft and requires no customer-installed patch; consult the MSRC advisory (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83711) to confirm remediation status and any tenant-side actions. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: establish contact with Microsoft support to request emergency mitigation guidance; review Azure AD B2C access logs for signs of exploitation and unusual privilege-escalation activity. …
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Same technique Authentication Bypass
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External POC / Exploit Code
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