CVE-2026-20839

CWE-284 — Improper Access Control5 documents5 sources
Severity
5.5MEDIUM
EPSS
0.0%
top 88.95%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
30
Microsoft Windows 10 Version 1607Microsoft Windows 10 Version 1809Microsoft Windows 10 Version 21h2+27 more
Timeline
PublishedJan 13

Description

Improper access control in Windows Client-Side Caching (CSC) Service allows an authorized attacker to disclose information locally.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:NExploitability: 1.8 | Impact: 3.6

Affected Packages29 packages

▶CVEListV5microsoft/windows_server_2008_r2_service_pack_16.1.7601.0 — 6.1.7601.28117
▶NVDmicrosoft/windows< 10.0.14393.8783+5
▶NVDmicrosoft/windows_10_1607< 10.0.14393.8783
▶NVDmicrosoft/windows_10_1809< 10.0.17763.8276

🔴Vulnerability Details

2
GHSA
GHSA-gwv7-x72m-q3cm: Improper access control in Windows Client-Side Caching (CSC) Service allows an authorized attacker to disclose information locally↗2026-01-13
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CVEList
Windows Client-Side Caching (CSC) Service Information Disclosure Vulnerability↗2026-01-13
▶

📋Vendor Advisories

1
Microsoft
Windows Client-Side Caching (CSC) Service Information Disclosure Vulnerability↗2026-01-13
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-20839 Impact, Exploitability, and Mitigation Steps | Wiz↗
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