What is the CVSS score of EUVD-2026-31509?

EUVD-2026-31509 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Azure Privileged Identity Management are affected by EUVD-2026-31509?

Azure Privileged Identity Management (PIM) contains a high-severity privilege escalation vulnerability enabling attackers with existing cloud credentials to gain administrative access, undermining…. A patch is available.

How to fix or mitigate EUVD-2026-31509?

Within 24 hours: Identify all Azure PIM deployments and current patch status across tenant instances. Within 7 days: Apply vendor security patch to Azure PIM service according to Microsoft guidance. Within 30 days: Conduct comprehensive audit of PIM administrative role assignments and review escalation activity logs for suspicious patterns.

Azure Privileged Identity Management EUVD-2026-31509

| CVE-2026-35430 HIGH

Authorization Bypass Through User-Controlled Key (CWE-639)

2026-05-22 microsoft

GHSA-gq45-95jh-mxm7

Microsoft Authentication Bypass

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

May 22, 2026 - 22:48 vuln.today

DescriptionCVE.org

Authorization bypass through user-controlled key in Azure Privileged Identity Management (PIM) allows an authorized attacker to elevate privileges over a network.

AnalysisAI

Privilege escalation in Microsoft Azure Privileged Identity Management (PIM) allows an authenticated attacker to bypass authorization checks by manipulating a user-controlled key, escalating privileges over the network. The flaw stems from an Insecure Direct Object Reference (IDOR) pattern (CWE-639) where the service trusts a client-supplied identifier when making authorization decisions. No public exploit identified at time of analysis, and the vulnerability is not currently listed in CISA KEV.

Technical ContextAI

Azure PIM is Microsoft's just-in-time privileged access management service in Entra ID (formerly Azure AD), used to grant time-bound, approval-gated elevation to roles like Global Administrator. The root cause is CWE-639 (Authorization Bypass Through User-Controlled Key), a class of IDOR flaw where the application uses an identifier supplied by the requester - such as a role assignment ID, target principal ID, or scope key - to look up or authorize an operation without independently verifying that the calling identity owns or is entitled to that resource. In a PIM context, this typically means an authenticated tenant user can substitute another principal's or role's identifier in an activation, assignment, or approval API request and have the backend honor it.

RemediationAI

Patch available per vendor advisory; because Azure PIM is a Microsoft-operated cloud service, the fix is applied server-side by Microsoft and no customer-installed update is required - administrators should confirm remediation status against the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35430. As compensating and durable controls, tenants should audit Entra ID role assignments and PIM activation history for unexpected elevations during the exposure window, enforce approval workflows and MFA on activation of privileged roles (which limits silent abuse but adds friction for legitimate admins), tighten eligible-role membership to the minimum set of users, and enable Entra ID sign-in and audit log forwarding to a SIEM to detect anomalous role-activation or assignment-modification API calls. Restricting eligibility scope and requiring approvals does not block the underlying authorization bypass but raises the chance of detection.