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VulnerabilityPublished Updated

CVE-2026-61936: Microsoft Windows 10 Version 1809 · Missing Authorization

Affects Microsoft Windows 10 Version 1809Source CVE Database V5

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Not known to be exploited · CVSS 5.5 Medium : upgrade to 10.0.17763.9121 when convenient.

Data as of 9 Nov 2026, 23:24 UTC

CVSS 3.1 base score
5.5Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (microsoft)CVSS 3.15.5
EPSS
0.3% chance of exploitation in 30 days – higher than 23% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 10.0.17763.9121, 10.0.19044.7663, 10.0.19045.7663 +6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
MicrosoftWindows 10 Version 1809Affected
  • >=10.0.17763.0 <10.0.17763.9121
Fixed in
  • 10.0.17763.9121
MicrosoftWindows 10 Version 21H2Affected
  • >=10.0.19044.0 <10.0.19044.7663
Fixed in
  • 10.0.19044.7663
MicrosoftWindows 10 Version 22H2Affected
  • >=10.0.19045.0 <10.0.19045.7663
Fixed in
  • 10.0.19045.7663
MicrosoftWindows 11 version 23H2Affected
  • >=10.0.22631.0 <10.0.22631.7517
Fixed in
  • 10.0.22631.7517
MicrosoftWindows 11 Version 23H2Affected
  • >=10.0.22631.0 <10.0.22631.7517
Fixed in
  • 10.0.22631.7517
MicrosoftWindows 11 Version 24H2Affected
  • >=10.0.26100.0 <10.0.26100.9168
Fixed in
  • 10.0.26100.9168

AI-suggested

Microsoft has released an official fix for this vulnerability. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 1809 (build 10.0.17763.0) as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-61936.

Description

Missing authorization in Windows Defender Firewall Service allows an authorized attacker to bypass a security feature locally.

References

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