CVE-2026-40400CWE-23

CVE-2026-40400

High · published July 14, 2026

CVSS v3.1
8.0
EPSS
1%
Percentile
58.4
In the wild
Unconfirmed
What it is

Relative path traversal in Windows PowerShell allows an authorized attacker to execute code over a network.

The record
Technical detail
CVSS v3.1
8.0 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00868 · 58.4th percentile
Weakness
CWE-23 · Relative Path Traversal
Published
2026-07-14T21:16Z
Affected products (22)
ProductVersionsFixed in
microsoft/windows_10_1607< 10.0.14393.933910.0.14393.9339
microsoft/windows_10_1607< 10.0.14393.933910.0.14393.9339
microsoft/windows_10_1809< 10.0.17763.902010.0.17763.9020
microsoft/windows_10_1809< 10.0.17763.902010.0.17763.9020
microsoft/windows_10_21h2< 10.0.19044.754810.0.19044.7548
microsoft/windows_10_21h2< 10.0.19044.754810.0.19044.7548
microsoft/windows_10_21h2< 10.0.19044.754810.0.19044.7548
microsoft/windows_10_22h2< 10.0.19045.754810.0.19045.7548
microsoft/windows_10_22h2< 10.0.19045.754810.0.19045.7548
microsoft/windows_10_22h2< 10.0.19045.754810.0.19045.7548
microsoft/windows_11_24h2< 10.0.26100.887510.0.26100.8875
microsoft/windows_11_24h2< 10.0.26100.887510.0.26100.8875
microsoft/windows_11_25h2< 10.0.26200.887510.0.26200.8875
microsoft/windows_11_25h2< 10.0.26200.887510.0.26200.8875
microsoft/windows_11_26h1< 10.0.28000.226910.0.28000.2269
microsoft/windows_11_26h1< 10.0.28000.226910.0.28000.2269
microsoft/windows_server_2012all versions—
microsoft/windows_server_2012all versions—
microsoft/windows_server_2016< 10.0.14393.933910.0.14393.9339
microsoft/windows_server_2019< 10.0.17763.902010.0.17763.9020
microsoft/windows_server_2022< 10.0.20348.538610.0.20348.5386
microsoft/windows_server_2025< 10.0.26100.3315810.0.26100.33158
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40400 · [email protected]
EPSS history
Timeline
  • 14 JUL 17:05Z
    Windows PowerShell Remote Code Execution Vulnerability
    cvelistv5