CVE-2026-27914
Published: 14 April 2026
Summary
CVE-2026-27914 is a high-severity Improper Access Control (CWE-284) vulnerability in Microsoft Windows 10 21H2. Its CVSS base score is 7.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 21.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and AC-6 (Least Privilege).
Deeper analysis
CVE-2026-27914 is an improper access control vulnerability in the Microsoft Management Console (MMC), published on 2026-04-14T18:16:59.180. It affects the MMC component, with a CVSS v3.1 base score of 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) and is linked to CWE-284.
A local attacker with low privileges (PR:L) can exploit this vulnerability through low-complexity means (AC:L) with no user interaction (UI:N). Successful exploitation enables local privilege escalation, resulting in high impacts to confidentiality, integrity, and availability (C:H/I:H/A:H).
The Microsoft Security Response Center (MSRC) advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27914 provides guidance on this vulnerability.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-22458
Vulnerability details
Improper access control in Microsoft Management Console allows an authorized attacker to elevate privileges locally.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
CVE describes a local improper access control flaw in MMC that is directly exploitable by a low-privileged attacker for privilege escalation (CWE-284, AV:L/PR:L), matching the definition of T1068 Exploitation for Privilege Escalation.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Timely identification, reporting, and correction of the improper access control flaw in MMC directly prevents local privilege escalation exploitation.
Enforcing least privilege restricts low-privileged local users from escalating to higher privileges via the MMC vulnerability.
Proper access enforcement mechanisms address the core improper access control issue in MMC that enables privilege escalation.