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Fencer Vulns
medium 6.0

CVE-2026-58638 json

Windows Boot Loader Security Feature Bypass Vulnerability

published 2026-07-14 3 mo ago modified 2026-11-01 7 d ago also EUVD-2026-44315

cvss
6.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

Summary

Missing cryptographic step in Windows Boot Loader allows an authorized attacker to bypass a security feature locally.

Patch / fix

  • Microsoft Windows 10 Version 1809 10.0.17763.9020
  • Microsoft Windows 10 Version 21H2 10.0.19044.7548
  • Microsoft Windows 10 Version 22H2 10.0.19045.7548
  • Microsoft Windows 11 Version 24H2 10.0.26100.8875
  • Microsoft Windows 11 Version 25H2 10.0.26200.8875
  • Microsoft Windows 11 version 26H1 10.0.28000.2525
  • Microsoft Windows Server 2012 6.2.9200.26226
  • Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.26226
  • Microsoft Windows Server 2012 R2 6.3.9600.23291
  • Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.23291
  • Microsoft Windows Server 2016 10.0.14393.9339
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.9339
  • Microsoft Windows Server 2019 10.0.17763.9020
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.9020
  • Microsoft Windows Server 2022 10.0.20348.5386
  • Microsoft Windows Server 2025 10.0.26100.33158
  • Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.33158

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
3 mo ago

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.0 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
CNA 3.1 6.0 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected products

  • Microsoft Windows 10 Version 1809
  • Microsoft Windows 10 Version 21H2
  • Microsoft Windows 10 Version 22H2
  • Microsoft Windows 11 Version 24H2
  • Microsoft Windows 11 Version 25H2
  • Microsoft Windows 11 version 26H1
  • 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-325 Missing Cryptographic Step

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.