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Fencer Vulns
high 8.8

CVE-2026-70149 json

Windows Client Side Caching driver (csc.sys) Elevation of Privilege Vulnerability

published 2026-10-13 26 d ago modified 2026-10-31 8 d ago also EUVD-2026-99688

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 60%
public exploits
0
none known

Summary

Exposure of sensitive information to an unauthorized actor in Windows Client Side Caching driver (csc.sys) allows an authorized attacker to disclose information locally.

Patch / fix

  • Microsoft Windows 10 Version 1607 10.0.14393.9612
  • Microsoft Windows 10 Version 1809 10.0.17763.9376
  • Microsoft Windows 10 Version 21H2 10.0.19044.7807
  • Microsoft Windows 10 Version 22H2 10.0.19045.7807
  • Microsoft Windows 11 version 23H2 10.0.22631.7652
  • Microsoft Windows 11 Version 24H2 10.0.26100.9711
  • Microsoft Windows 11 Version 25H2 10.0.26200.9711
  • Microsoft Windows 11 version 26H1 10.0.28000.3231
  • Microsoft Windows 11 Version 26H2 10.0.26300.9711
  • Microsoft Windows Server 2012 6.2.9200.26434
  • Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.26434
  • Microsoft Windows Server 2012 R2 6.3.9600.23470
  • Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.23470
  • Microsoft Windows Server 2016 10.0.14393.9612
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.9612
  • Microsoft Windows Server 2019 10.0.17763.9376
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.9376
  • Microsoft Windows Server 2022 10.0.20348.5761
  • Microsoft Windows Server 2025 10.0.26100.33650
  • Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.33650

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
26 d ago

Exploit prediction

0.93% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Microsoft Windows 10 Version 1607
  • Microsoft Windows 10 Version 1809
  • Microsoft Windows 10 Version 21H2
  • Microsoft Windows 10 Version 22H2
  • Microsoft Windows 11 version 23H2
  • Microsoft Windows 11 Version 24H2
  • Microsoft Windows 11 Version 25H2
  • Microsoft Windows 11 version 26H1
  • Microsoft Windows 11 Version 26H2
  • Microsoft Windows Server 2012
  • Microsoft Windows Server 2012 (Server Core installation)
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2012 R2 (Server Core installation)
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2016 (Server Core installation)
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2019 (Server Core installation)
  • Microsoft Windows Server 2022
  • Microsoft Windows Server 2025
  • Microsoft Windows Server 2025 (Server Core installation)

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.