CVE-2026-42976CWE-306

CVE-2026-42976

High · published August 11, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
21.3
In the wild
Unconfirmed
What it is

Missing authentication for critical function in Windows RPC API allows an authorized attacker to elevate privileges locally.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00298 · 21.3th percentile
Weakness
CWE-306 · Missing Authentication for Critical Function
Published
2026-08-11T21:17Z
Affected products (22)
ProductVersionsFixed in
microsoft/windows_10_1607< 10.0.14393.941810.0.14393.9418
microsoft/windows_10_1607< 10.0.14393.941810.0.14393.9418
microsoft/windows_10_1809< 10.0.17763.911510.0.17763.9115
microsoft/windows_10_1809< 10.0.17763.911510.0.17763.9115
microsoft/windows_10_21h2< 10.0.19044.766310.0.19044.7663
microsoft/windows_10_21h2< 10.0.19044.766310.0.19044.7663
microsoft/windows_10_21h2< 10.0.19044.766310.0.19044.7663
microsoft/windows_10_22h2< 10.0.19045.766310.0.19045.7663
microsoft/windows_10_22h2< 10.0.19045.766310.0.19045.7663
microsoft/windows_10_22h2< 10.0.19045.766310.0.19045.7663
microsoft/windows_11_24h2< 10.0.26100.910610.0.26100.9106
microsoft/windows_11_24h2< 10.0.26100.910610.0.26100.9106
microsoft/windows_11_25h2< 10.0.26200.910610.0.26200.9106
microsoft/windows_11_25h2< 10.0.26200.910610.0.26200.9106
microsoft/windows_11_26h1< 10.0.28000.270410.0.28000.2704
microsoft/windows_11_26h1< 10.0.28000.270410.0.28000.2704
microsoft/windows_server_2012all versions—
microsoft/windows_server_2012all versions—
microsoft/windows_server_2016< 10.0.14393.941810.0.14393.9418
microsoft/windows_server_2019< 10.0.17763.911510.0.17763.9115
microsoft/windows_server_2022< 10.0.20348.544010.0.20348.5440
microsoft/windows_server_2025< 10.0.26100.3322210.0.26100.33222
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42976 · [email protected]
EPSS history
Timeline
  • 11 AUG 17:05Z
    Remote Access Management service/API (RPC server) Elevation of Privilege Vulnerability
    cvelistv5