What is CVE-2026-26183?

CVE-2026-26183 is a high-severity vulnerability in Microsoft Windows Server 2012, classified under Improper Access Control. CVSS score: 7.8/10. Published 2026-04-14.

How severe is CVE-2026-26183?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Microsoft Windows Server 2012

CVE-2026-26183

Improper access control in Windows RPC API allows an authorized attacker to elevate privileges locally.

EPSS: 0.001 (16.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C.

Affected products

Microsoft Windows Server 2012 — versions 6.2.9200.0
Microsoft Windows Server 2012 R2 — versions 6.3.9600.0
Microsoft Windows Server 2012 R2 (Server Core Installation) — versions 6.3.9600.0
Microsoft Windows Server 2012 (Server Core Installation) — versions 6.2.9200.0
Microsoft Windows Server 2016 — versions 10.0.14393.0
Microsoft Windows Server 2016 (Server Core Installation) — versions 10.0.14393.0
Microsoft Windows Server 2019 — versions 10.0.17763.0
Microsoft Windows Server 2019 (Server Core Installation) — versions 10.0.17763.0
Microsoft Windows Server 2022 — versions 10.0.20348.0
Microsoft Windows Server 2022, 23h2 Edition (Server Core Installation) — versions 10.0.25398.0

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

Remote Access Management service/API (RPC server) Elevation of Privilege Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-26183?: CVE-2026-26183 is a high-severity vulnerability in Microsoft Windows Server 2012, classified under Improper Access Control. CVSS score: 7.8/10. Published 2026-04-14.
How severe is CVE-2026-26183?: High severity. CVSS v3 base score is 7.8 out of 10.