Issuing CNA: Microsoft

Use of uninitialized resource in Dynamic Root of Trust for Measurement (DRTM) allows an authorized attacker to disclose information locally.

What type of information could be disclosed by this vulnerability?

The type of information that could be disclosed if an attacker successfully exploited this vulnerability is Windows cryptographic secrets.

Information published.

Issuing CNA: Microsoft

Windows Secure Boot stores Microsoft certificates in the UEFI KEK and DB. These original certificates are approaching expiration, and devices containing affected certificate versions must update them to maintain Secure Boot functionality and avoid compromising security by losing security fixes related to Windows boot manager or Secure Boot.

The operating system’s certificate update protection mechanism relies on firmware components that might contain defects, which can cause certificate trust updates to fail or behave unpredictably. This leads to potential disruption of the Secure Boot trust chain and requires careful validation and deployment to restore intended security guarantees.

For more information see this CVE and Windows Secure Boot certificate expiration and CA updates.

What kind of security feature could be bypassed by successfully exploiting this vulnerability?

An attacker who successfully exploited this vulnerability could bypass Secure Boot.

Where can I find more information about Windows Secure Boot certificate expiration?

To understand more about Windows Secure Boot and the importance of taking immediate action to renew your certificates see Windows Secure Boot certificate expiration and CA updates.

See also the following links for the actions you need to take based on your Windows device:

• Windows devices for home users, businesses, and schools with Microsoft-managed updates
• Windows devices with IT-managed updates
• Secure Boot FAQs can be found here: Secure Boot FAQs

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?

Successful exploitation of this vulnerability requires an attacker to have a deep understanding of the system and the ability to manipulate its components to trigger a specific condition. Successful exploitation is not guaranteed and depends on a combination of factors that may include the environment, system configuration, and the presence of additional security measures.

Information published.

Issuing CNA: Microsoft

Improper access control in Windows Deployment Services allows an unauthorized attacker to execute code over an adjacent network.

Are there additional steps I need to take to be protected from this vulnerability?

Admins should take the following steps to be protected from CVE-2026-0386:

1. Audit existing WDS usage and identify hands-free deployments.
2. Opt in for protection by configuring the registry settings described in: Windows Deployment Services (WDS) Hands-Free Deployment Hardening Guidance. This will provide immediate protection.

This security protection will be enabled by default in a future security update release and no additional administrator action will be required.

How is Microsoft addressing this vulnerability?

To address this vulnerability, by default the hands-free deployment feature will not be supported beginning with a security update in a future release in mid-2026.

Why is the WDS Unattended Installation feature being deprecated?

The legacy WDS workflow transmits unattend.xml over unauthenticated RPC, exposing sensitive credentials during PXE boot. This creates a security risk, including potential machine-in-the-middle (MITM) attacks. To strengthen security posture, Microsoft is enforcing authenticated RPC by default and removing the insecure workflow.

Isn’t using WDS within a network-isolated environment sufficient to mitigate this vulnerability?

Even in isolated networks, unauthenticated RPC introduces attack surfaces that can be exploited internally. Security best practices require eliminating unencrypted credential transmission and enforcing authenticated channels.

What is the impact of this change?

Hands-free deployments that rely on unauthenticated RPC will no longer work by default. Administrators can override this behavior via a registry key (See Windows Deployment Services (WDS) Hands-Free Deployment Hardening Guidance, but this is not recommended for production environments.

Are there any recommended alternative solutions?

Please see Windows Deployment Services (WDS) boot.wim support for alternate recommendations by Microsoft.

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?

The attacker must inject themselves into the logical network path between the target and the resource requested by the victim to read or modify network communications. This is called a machine-in-the-middle (MITM) attack.

According to the CVSS metric, the attack vector is adjacent (AV:A). What does that mean for this vulnerability?

An authenticated attacker could exploit this vulnerability with LAN access.

Information published.

Issuing CNA: Microsoft

Missing authentication for critical function in SQL Server allows an authorized attacker to elevate privileges over a network.

I am running SQL Server on my system. What action do I need to take?

Update your relevant version of SQL Server. Any applicable driver fixes are included in those updates.

There are GDR and/or CU (Cumulative Update) updates offered for my version of SQL Server. How do I know which update to use?

• First, determine your SQL Server version number. For more information on determining your SQL Server version number, see Microsoft Knowledge Base Article 321185 - How to determine the version, edition, and update level of SQL Server and its components.
• Second, in the following table, locate your version number or the version range that your version number falls within. The corresponding update is the one you need to install.

Note If your SQL Server version number is not represented in the table below, your SQL Server version is no longer supported. Please upgrade to the latest Service Pack or SQL Server product to apply this and future security updates.

What are the GDR and CU update designations and how do they differ?

The General Distribution Release (GDR) and Cumulative Update (CU) designations correspond to the two different servicing options in place for SQL Server baseline releases. A baseline can be either an RTM release or a Service Pack release.

• GDR updates – cumulatively only contain security updates for the given baseline.
• CU updates – cumulatively contain all functional fixes and security updates for the given baseline.

For any given baseline, either the GDR or CU updates could be options (see below).

• If SQL Server installation is at a baseline version, you can choose either the GDR or CU update.
• If SQL Server installation has intentionally only installed past GDR updates, then choose to install the GDR update package.
• If SQL Server installation has intentionally installed previous CU updates, then choose to install the CU security update package.

Note: You are allowed to make a change from GDR updates to CU updates ONE TIME. Once a SQL Server CU update is applied to a SQL Server installation, there is NO way to go back to the GDR update path.

Can the security updates be applied to SQL Server instances on Windows Azure (IaaS)?

Yes. SQL Server instances on Windows Azure (IaaS) can be offered the security updates through Microsoft Update, or customers can download the security updates from Microsoft Download Center and apply them manually.

What privileges could be gained by an attacker who successfully exploited the vulnerability?

An attacker who successfully exploited this vulnerability could gain debugging privileges including the ability to dump memory.

Information published.

Issuing CNA: Microsoft

Improper verification of cryptographic signature in Windows Admin Center allows an authorized attacker to elevate privileges locally.

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?

Successful exploitation of this vulnerability requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected.

What privileges could be gained by an attacker who successfully exploited the vulnerability?

An attacker who successfully exploited the vulnerability could gain local admin privileges on targeted WAC-managed machines within a tenant.

According to the CVSS metric, successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability?

This vulnerability could lead to the attacker gaining the ability to interact with other tenant’s applications and content.

How could an attacker exploit this vulnerability?

An attacker with local administrator privileges could exploit this vulnerability by sending a specially crafted HTTPS request to the targeted head node.

How do I get the update for Windows Admin Center (WAC) in Azure?

You can upgrade WAC in the Portal extension on your VM on Azure Portal by:

• Automatic upgrades: By default customers are onboarded to automatic upgrades where the latest version is auto-installed when it becomes available.
• If the automatic upgrade is not installed you can get the update by going to the server on Azure Portal that you use, as follows:
  • In Settings + extensions see 'AdminCenter'. If an update is available use the Update button next to "Update available' to install the update for your WAC extension.

For more information see Manage a Windows VM using Windows Admin Center in Azure

Information published.

Issuing CNA: Microsoft

Incorrect privilege assignment in Windows Hello allows an unauthorized attacker to perform tampering locally.

Information published.

Issuing CNA: Microsoft

Exposure of sensitive information to an unauthorized actor in Desktop Windows Manager allows an authorized attacker to disclose information locally.

What type of information could be disclosed by this vulnerability?

The type of information that could be disclosed if an attacker successfully exploited this vulnerability is a section address from a remote ALPC port which is user-mode memory.

Information published.

Issuing CNA: Microsoft

Concurrent execution using shared resource with improper synchronization ('race condition') in Printer Association Object allows an authorized attacker to elevate privileges locally.

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?

Successful exploitation of this vulnerability requires an attacker to win a race condition.

What privileges could be gained by an attacker who successfully exploited the vulnerability?

An attacker who successfully exploited this vulnerability could gain the privileges of the compromised user.

Information published.

Issuing CNA: Microsoft

Time-of-check time-of-use (toctou) race condition in Windows Kernel Memory allows an authorized attacker to elevate privileges locally.

What privileges could be gained by an attacker who successfully exploited this vulnerability?

An attacker who successfully exploited this vulnerability could gain Kernel Memory Access.

Information published.

Issuing CNA: Microsoft

Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

What privileges could be gained by an attacker who successfully exploited this vulnerability?

An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Information published.

Issuing CNA: Microsoft

Access of resource using incompatible type ('type confusion') in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.

What privileges could be gained by an attacker who successfully exploited this vulnerability?

An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Information published.

Issuing CNA: Microsoft

Improper input validation in Windows LDAP - Lightweight Directory Access Protocol allows an authorized attacker to perform tampering over a network.

Information published.

Issuing CNA: Microsoft

Concurrent execution using shared resource with improper synchronization ('race condition') in Graphics Kernel allows an authorized attacker to elevate privileges locally.

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?

Successful exploitation of this vulnerability requires an attacker to win a race condition.

What privileges could be gained by an attacker who successfully exploited this vulnerability?

An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Information published.

Issuing CNA: Microsoft

Concurrent execution using shared resource with improper synchronization ('race condition') in Capability Access Management Service (camsvc) allows an authorized attacker to elevate privileges locally.

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?

Successful exploitation of this vulnerability requires an attacker to win a race condition.

What privileges could be gained by an attacker who successfully exploited this vulnerability?

An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Information published.

Issuing CNA: Microsoft

Time-of-check time-of-use (toctou) race condition in Windows Installer allows an authorized attacker to elevate privileges locally.

What privileges could be gained by an attacker who successfully exploited this vulnerability?

An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Information published.