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Fencer Intel
high 7.8

CVE-2025-48799 json

Windows Update Service Elevation of Privilege Vulnerability

published last yr. modified 4mo ago also EUVD-2025-20603

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

Improper link resolution before file access ('link following') in Windows Update Service allows an authorized attacker to elevate privileges locally.

Patch / fix

  • Microsoft Windows 10 Version 1607 10.0.14393.8246
  • Microsoft Windows 10 Version 1809 10.0.17763.7558
  • Microsoft Windows 10 Version 21H2 10.0.19044.6093
  • Microsoft Windows 10 Version 22H2 10.0.19045.6093
  • Microsoft Windows 11 version 22H2 10.0.22621.5624
  • Microsoft Windows 11 version 22H3 10.0.22631.5624
  • Microsoft Windows 11 Version 23H2 10.0.22631.5624
  • Microsoft Windows 11 Version 24H2 10.0.26100.4652
  • Microsoft Windows Server 2025 10.0.26100.4652
  • Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.4652

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
last yr.

Exploit prediction

1.33% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • vicarius.io https://www.vicarius.io/vsociety/posts/cve-2025-48799-mitigation-script-elevation-of-privilege-vulnerability-in-windows-update-service referenced PoC, tagged "exploit" by a source, unverified
  • vicarius.io https://www.vicarius.io/vsociety/posts/cve-2025-48799-detection-script-elevation-of-privilege-vulnerability-in-windows-update-service referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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 22H2
  • Microsoft Windows 11 version 22H3
  • Microsoft Windows 11 Version 23H2
  • Microsoft Windows 11 Version 24H2
  • Microsoft Windows Server 2025
  • Microsoft Windows Server 2025 (Server Core installation)

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access

References

Sources

Fencer Intel 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.