CVE.org (no NVD analysis yet)· CNA microsoft

CVE-2026-105590: Windows Active Directory Certificate Services Security Feature Bypass

MediumCVSS 5.3 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 21/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.48% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
Fixed version: Windows Server 2016 10.0.14393.9688; Windows Server 2016 (Server Core installation) 10.0.14393.9688; Windows Server 2019 10.0.17763.9487.
Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Windows Server 2016 10.0.14393.9688; Windows Server 2016 (Server Core installation) 10.0.14393.9688; Windows Server 2019 10.0.17763.9487 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Improper certificate validation in Windows Active Directory Certificate Services allows an authorized attacker to bypass a security feature over a network.

Weak crypto

EUVD-2026-121720

Published: Nov 10, 2026
Updated: Nov 12, 2026
EPSS: 0.4% · 42th percentile
CWE: CWE-295

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 21 / 40 · 5.3 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.4%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · microsoft: 5.3; NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

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Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

Microsoft Windows Server 2016
- 10.0.14393.0 and later · before 10.0.14393.9688affected
Microsoft Windows Server 2016 (Server Core installation)
- 10.0.14393.0 and later · before 10.0.14393.9688affected
Microsoft Windows Server 2019
- 10.0.17763.0 and later · before 10.0.17763.9487affected
Microsoft Windows Server 2019 (Server Core installation)
- 10.0.17763.0 and later · before 10.0.17763.9487affected
Microsoft Windows Server 2022
- 10.0.20348.0 and later · before 10.0.20348.5870affected
Microsoft Windows Server 2025
- 10.0.26100.0 and later · before 10.0.26100.33822affected
Microsoft Windows Server 2025 (Server Core installation)
- 10.0.26100.0 and later · before 10.0.26100.33822affected

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

CVE-2024-38076Windows Remote Desktop Licensing Service Remote Code Execution Vulnerability
40Plan
CVE-2021-34458Windows Kernel Remote Code Execution Vulnerability
40Plan
CVE-2026-88243Windows DHCP Server Remote Code Execution Vulnerability
39Monitor

Published before and after this one in the same product

← EarlierCVE-2026-105579Nov 10, 2026 · Windows DNS Information Disclosure Vulnerability
30Monitor
← EarlierCVE-2026-105588Nov 10, 2026 · Windows DHCP Server Elevation of Privilege Vulnerability
25Monitor
Later →CVE-2026-108415Nov 10, 2026 · Windows File Server Resource Management Service Elevation of Privilege Vulnerability
27Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Windows Server 2016	10.0.14393.9688 · KB5131291	Microsoft (MSRC)
Windows Server 2016 (Server Core installation)	10.0.14393.9688 · KB5131291	Microsoft (MSRC)
Windows Server 2019	10.0.17763.9487 · KB5131085	Microsoft (MSRC)
Windows Server 2019 (Server Core installation)	10.0.17763.9487 · KB5131085	Microsoft (MSRC)
Windows Server 2022	10.0.20348.5870 · KB5131090	Microsoft (MSRC)
Windows Server 2022 (Server Core installation)	10.0.20348.5870 · KB5131090	Microsoft (MSRC)
Windows Server 2025	10.0.26100.33730 · KB5131077	Microsoft (MSRC)
Windows Server 2025	10.0.26100.33822 · KB5131080	Microsoft (MSRC)
Windows Server 2025 (Server Core installation)	10.0.26100.33730 · KB5131077	Microsoft (MSRC)
Windows Server 2025 (Server Core installation)	10.0.26100.33822 · KB5131080	Microsoft (MSRC)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedNov 10, 2026
Fix recordedNov 12, 2026+1 d
TodayNov 13, 2026+2 d

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-26-1506 · Nov 11, 2026(Microsoft Çoklu Ürün Güvenlik Bildirimi)
TR-26-1501 · Nov 11, 2026(Microsoft Windows Güvenlik Bildirimi)

All national notices →

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
A low-privileged account is enough.
No user action is required.
Special conditions such as timing or configuration are required.

If successful

Confidentiality: none
Integrity: high · data or configuration can be modified
Availability: none

Attack vector: Network
Attack complexity: High
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: High
Availability impact: None

Weakness class (CWE)

CWE-295 · Improper Certificate Validation

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N

nvd-secondary

Root cause

A certificate validation error is silently swallowed instead of terminating the connection. Often, code added for a test environment makes its way into production.

The bug in code

The whole CWE-295 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

kotlin

1override fun checkServerTrusted(chain: Array<X509Certificate>, type: String) {
2  // Left empty for the test environment
3}

Fixed

kotlin

1val client = OkHttpClient.Builder()
2  .certificatePinner(
3    CertificatePinner.Builder()
4      .add("api.sirius.example", "sha256/…")
5      .build()
6  ).build()

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Nov 12, 2026, 3:42 AM UTC
SSVC exploitation— → noneNov 10, 2026, 10:07 PM UTC
Exploit maturity— → noneNov 10, 2026, 8:07 PM UTC

For records you follow, these changes also arrive as notifications. →

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-105590

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records