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CVE-2026-62879· NVD / CVE Program· CNA microsoft

Windows SmartScreen Tampering Vulnerability

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.30% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Windows 10 Version 1809 for 32-bit Systems 10.0.17763.9376; Windows 10 Version 1809 for x64-based Systems 10.0.17763.9376; Windows 10 Version 21H2 for 32-bit Systems 10.0.19044.7807.

Low priority for now. Upgrade to Windows 10 Version 1809 for 32-bit Systems 10.0.17763.9376; Windows 10 Version 1809 for x64-based Systems 10.0.17763.9376; Windows 10 Version 21H2 for 32-bit Systems 10.0.19044.7807 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

Missing authentication for critical function in Windows SmartScreen allows an authorized attacker to perform tampering locally.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Oct 13, 2026
Updated
Oct 21, 2026
EPSS
0.3% · 22th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · microsoft
5.5
NVD has not scored this yet; the score shown is the CNA’s.

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

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.

Follow CVE-2026-62879

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

—

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 10 Version 1809

    • 10.0.17763.0 and later · before 10.0.17763.9376affected

  • Microsoft Windows 10 Version 21H2

    • 10.0.19044.0 and later · before 10.0.19044.7807affected

  • Microsoft Windows 10 Version 22H2

    • 10.0.19045.0 and later · before 10.0.19045.7807affected

  • Microsoft Windows 11 version 23H2

    • 10.0.22631.0 and later · before 10.0.22631.7652affected

  • Microsoft Windows 11 Version 23H2

    • 10.0.22631.0 and later · before 10.0.22631.7652affected

  • Microsoft Windows 11 Version 24H2

    • 10.0.26100.0 and later · before 10.0.26100.9711affected

  • Microsoft Windows 11 Version 25H2

    • 10.0.26200.0 and later · before 10.0.26200.9711affected

  • Microsoft Windows 11 version 26H1

    • 10.0.28000.0 and later · before 10.0.28000.3231affected

  • Microsoft Windows 11 Version 26H2

    • 10.0.26300.0 and later · before 10.0.26300.9711affected

  • Microsoft Windows Server 2019

    • 10.0.17763.0 and later · before 10.0.17763.9376affected

  • Microsoft Windows Server 2019 (Server Core installation)

    • 10.0.17763.0 and later · before 10.0.17763.9376affected

  • Microsoft Windows Server 2022

    • 10.0.20348.0 and later · before 10.0.20348.5761affected

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-69639Windows libarchive Remote Code Execution Vulnerability
    39Monitor
  • CVE-2026-96913Windows Kernel Elevation of Privilege Vulnerability
    35Monitor
  • CVE-2026-88157Microsoft OpenSSH for Windows Remote Code Execution Vulnerability
    35Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-108471Oct 13, 2026 · Windows Virtualization-Based Security (VBS) Enclave Elevation of Privilege Vulnerability
    35Monitor
  • ← EarlierCVE-2026-61931Oct 13, 2026 · Windows Perception Simulation Service Elevation of Privilege Vulnerability
    31Monitor
  • Later →CVE-2026-69763Oct 13, 2026 · Windows Storage Elevation of Privilege Vulnerability
    28Monitor

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
Windows 10 Version 1809 for 32-bit Systems10.0.17763.9376 · KB5126651Microsoft (MSRC)
Windows 10 Version 1809 for x64-based Systems10.0.17763.9376 · KB5126651Microsoft (MSRC)
Windows 10 Version 21H2 for 32-bit Systems10.0.19044.7807 · KB5126657Microsoft (MSRC)
Windows 10 Version 21H2 for ARM64-based Systems10.0.19044.7807 · KB5126657Microsoft (MSRC)
Windows 10 Version 21H2 for x64-based Systems10.0.19044.7807 · KB5126657Microsoft (MSRC)
Windows 10 Version 22H2 for 32-bit Systems10.0.19045.7807 · KB5126657Microsoft (MSRC)
Windows 10 Version 22H2 for ARM64-based Systems10.0.19045.7807 · KB5126657Microsoft (MSRC)
Windows 10 Version 22H2 for x64-based Systems10.0.19045.7807 · KB5126657Microsoft (MSRC)
Windows 11 Version 23H2 for ARM64-based Systems10.0.22631.7652 · KB5126653Microsoft (MSRC)
Windows 11 Version 23H2 for x64-based Systems10.0.22631.7652 · KB5126653Microsoft (MSRC)
Windows 11 Version 24H2 for ARM64-based Systems10.0.26100.9711 · KB5127648Microsoft (MSRC)
Windows 11 Version 24H2 for x64-based Systems10.0.26100.9711 · KB5127648Microsoft (MSRC)
Windows 11 Version 25H2 for ARM64-based Systems10.0.26200.9711 · KB5127648Microsoft (MSRC)
Windows 11 Version 25H2 for x64-based Systems10.0.26200.9711 · KB5127648Microsoft (MSRC)
Windows 11 Version 26H1 for ARM64-based Systems10.0.28000.3231 · KB5127646Microsoft (MSRC)
Windows 11 version 26H1 for x64-based Systems10.0.28000.3231 · KB5127646Microsoft (MSRC)
Windows 11 Version 26H2 for ARM64-based Systems10.0.26300.9711 · KB5127648Microsoft (MSRC)
Windows 11 Version 26H2 for x64-based Systems10.0.26300.9711 · KB5127648Microsoft (MSRC)
Windows Server 201910.0.17763.9376 · KB5126651Microsoft (MSRC)
Windows Server 2019 (Server Core installation)10.0.17763.9376 · KB5126651Microsoft (MSRC)
Windows Server 202210.0.20348.5761 · KB5126655Microsoft (MSRC)
Windows Server 2022 (Server Core installation)10.0.20348.5761 · KB5126655Microsoft (MSRC)
Windows Server 202510.0.26100.33650 · KB5126646Microsoft (MSRC)
Windows Server 2025 (Server Core installation)10.0.26100.33650 · KB5126646Microsoft (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.

  1. Published
  2. Fix recordedsame day
  3. TodayOct 22, 2026+8 d
EPSS, last 120 days

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

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-705800 days apartWindows Credential Guard Spoofing Vulnerability
    35Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2026-701120 days apartWindows Spaceport.sys Remote Code Execution Vulnerability
    31Monitor
  • CVE-2026-837120 days apartWindows NTFS Remote Code Execution Vulnerability
    31Monitor
  • CVE-2026-700840 days apartWindows Projected File System Information Disclosure Vulnerability
    22Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-306 · Missing Authentication for Critical Function

CVSS vector

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

nvd-secondary

Root cause

A function added for development or support ships to production without authentication. It often relies on the assumption that it is “only reachable from the internal network.”

The bug in code

The whole CWE-306 class

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

Vulnerable

ts
// Added for the support teamapp.post("/maintenance/reset", resetDevice);

Fixed

ts
if (config.maintenanceEnabled) {  app.post(    "/maintenance/reset",    requireSession, requireRole("admin"), resetDevice  );}

Attack context

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

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓
  2. SSVC exploitation— → none
  3. Exploit maturity— → none

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

References

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

All records