Vulnerability · NVD
CVE-2026-20839
MEDIUM 5.5
Improper access control in Windows Client-Side Caching (CSC) Service allows an authorized attacker to disclose information locally.
Attack vector : Local
No user interaction
Show raw CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS
0.46%
exploit very unlikely
percentile 37.9%
OS versions that fix this CVE
This CVE is resolved by the following OS security releases. Update the OS to at least the listed version.
- Windows Server 2025 Fixed in 10.0.26100.32230
- Windows Server 2022 (Server Core installation) Fixed in 10.0.20348.4648
- Windows Server 2022 Fixed in 10.0.25398.2092
- Windows Server 2019 Fixed in 10.0.17763.8276
- Windows Server 2016 Fixed in 10.0.14393.8783
- Windows 11 25H2 · 2025-H2 Fixed in 10.0.26200.7623
- Windows 11 24H2 · 2024-H2 Fixed in 10.0.26100.7623
- Windows 11 23H2 · 2023-H2 Fixed in 10.0.22631.6491
- Windows 10 22H2 · 2022-H2 Fixed in 10.0.19045.6809
- Windows 10 21H2 · 2021-H2 Fixed in 10.0.19044.6809
- Windows 10 1809 · 2018-09 Fixed in 10.0.17763.8276
- Windows 10 1607 · 2016-07 Fixed in 10.0.14393.8783