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Microsoft disclosed and patched CVE-2026-25177, an Active Directory Domain Services (AD DS) Elevation of Privilege vulnerability, through its Security Update Guide. The issue affects a core identity service used across Windows enterprise environments, where successful exploitation could allow an attacker to gain higher privileges within an AD-managed domain and increase control over affected systems or directory operations.
The new advisory follows earlier Microsoft fixes for similar AD DS privilege-escalation bugs, including CVE-2022-34691 and CVE-2021-42287, underscoring the continued security risk around domain controller and directory service weaknesses. Organizations running AD DS should prioritize Microsoft’s security updates, assess exposure across domain controllers, and review privileged account activity for signs of attempted abuse tied to elevation-of-privilege paths in Active Directory.
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3 events from the most recent confirmed update back to the earliest known activity.
Microsoft published a Security Update Guide entry for CVE-2026-25177, describing an Active Directory Domain Services elevation of privilege vulnerability.
Microsoft published a Security Update Guide entry for CVE-2022-34691, another Active Directory Domain Services elevation of privilege vulnerability.
Microsoft published a Security Update Guide entry for CVE-2021-42287, an Active Directory Domain Services elevation of privilege vulnerability.
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Microsoft disclosed multiple **privilege escalation** vulnerabilities in core enterprise products, including **Active Directory Domain Services** and **SQL Server**, with public reporting highlighting network-reachable attack paths that require only authenticated or otherwise authorized access. **CVE-2026-25177** affects AD DS and was described as an elevation-of-privilege issue tied to improper restriction of file and resource names, enabling abuse of crafted Unicode characters to create duplicate `SPN` or `UPN` values. Reporting indicates this can interfere with Kerberos ticket handling, potentially causing denial of service, triggering fallback to **NTLM** where enabled, and ultimately enabling escalation to **SYSTEM**-level control in affected environments. Microsoft also disclosed **CVE-2026-21262** in **SQL Server**, an **Important**-rated flaw with a **CVSS 8.8** score that allows an authenticated attacker to elevate privileges to `sysadmin`, giving full control over the database instance. Public reporting said Microsoft assessed exploitation as **less likely** and had not observed active in-the-wild abuse at disclosure time, but noted the issue was publicly disclosed, increasing the risk of follow-on exploit development. Other referenced items about **ADCS ESC1**, **Cisco SD-WAN Manager**, and **n8n** concern separate products and unrelated vulnerabilities, while the standalone MSRC entry does not provide enough detail in the supplied content to confirm it is part of the same specific event.
Jun 29, 2026
Microsoft’s November 2024 security updates patched 89 vulnerabilities, including 52 remote code execution flaws and several critical issues across Windows, .NET, Visual Studio, Exchange Server, and Active Directory Certificate Services (AD CS). Among the most notable fixes was **CVE-2024-49019**, an AD CS privilege escalation bug tied to insecure certificate template configurations, alongside actively exploited flaws **CVE-2024-43451** in Windows NT LAN Manager and **CVE-2024-49039** in Windows Task Scheduler. Other critical vulnerabilities addressed included **CVE-2024-43498** in .NET and Visual Studio, **CVE-2024-43625** in Windows VMSwitch, **CVE-2024-43639** in Windows Kerberos, and **CVE-2024-49056** affecting `airlift.microsoft.com`. Research published alongside the updates highlighted how AD CS abuse can extend beyond previously cataloged escalation chains, describing an **EKUwu** technique that leverages certificate Extended Key Usage handling to obtain unintended privileges in misconfigured environments. The findings reinforced that organizations running AD CS face elevated risk when certificate templates are loosely controlled, and they underscored Microsoft’s guidance to rapidly deploy the November patches and review certificate template settings to reduce exposure to privilege escalation and identity compromise.
Jul 24, 2026
Microsoft disclosed and patched **CVE-2017-8563**, an elevation-of-privilege flaw in Windows LDAP authentication that could let a man-in-the-middle attacker forward authentication requests to a vulnerable LDAP server. The issue affects Windows LDAP servers, including systems running **Active Directory Domain Services (AD DS)** and **Active Directory Lightweight Directory Services (AD LDS)**, when they are configured to require signing or sealing on incoming connections. The security update adds support for **Extended Protection for Authentication**, allowing affected LDAP servers to detect and block forwarded authentication attempts. Organizations using Windows-based directory services are advised to apply the Microsoft update and enable the protection to reduce the risk of authentication relay leading to privilege escalation in Active Directory environments.
Jun 29, 2026