Cyber Resilience

CVE-2026-69438

Microsoft Windows 10 21H2 ≤ 10.0.19044.7725

Published
08 September 2026
Modified
29 September 2026
Patch / advisory
View advisory
CVSS Score v3.1 8.1
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0072 52th percentile
Risk Priority 61 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-69438 is a high-severity Incorrect Conversion between Numeric Types (CWE-681) vulnerability in Microsoft Windows 10 21H2. Its CVSS base score is 8.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked in the top 48% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SA-8 (Security and Privacy Engineering Principles) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

Incorrect conversion between numeric types in Microsoft JScript allows an unauthorized attacker to execute code over a network.

CWE(s)
CWE-681

Related Threats

MITRE ATT&CK Enterprise Techniques

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-4602Shared CWE-681
CVE-2026-34550Shared CWE-681
CVE-2023-23401Shared CWE-681
CVE-2026-88362Shared CWE-681
CVE-2026-4931Shared CWE-681
CVE-2024-26162Shared CWE-681
CVE-2024-49093Shared CWE-681
CVE-2026-77412Shared CWE-681
CVE-2023-21736Shared CWE-681
CVE-2023-46848Shared CWE-681

Affected Assets

microsoft
windows 10 1607
≤ 10.0.14393.9512 · ≤ 10.0.14393.9512
microsoft
windows 10 1809
≤ 10.0.17763.9245 · ≤ 10.0.17763.9245
microsoft
windows 10 21h2
≤ 10.0.19044.7725 · ≤ 10.0.19044.7725 · ≤ 10.0.19044.7725
microsoft
windows 10 22h2
≤ 10.0.19045.7725 · ≤ 10.0.19045.7725 · ≤ 10.0.19045.7725
microsoft
windows 11 23h2
≤ 10.0.22631.7582 · ≤ 10.0.22631.7582
microsoft
windows 11 24h2
≤ 10.0.26100.9445 · ≤ 10.0.26100.9445
microsoft
windows 11 25h2
≤ 10.0.26200.9445 · ≤ 10.0.26200.9445
microsoft
windows 11 26h1
≤ 10.0.28000.2954 · ≤ 10.0.28000.2954
microsoft
windows server 2012
all versions, r2
microsoft
windows server 2016
≤ 10.0.14393.9512
+3 more product configuration(s) — see NVD for full list

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and evaluation can discover incorrect numeric conversions through targeted test cases.

SA-8 Security and Privacy Engineering Principles partial match

Engineering principles can mandate safe numeric handling and range checks that structurally avoid bad conversions.

SI-10 Information Input Validation partial match

Input validation directly stops malformed or out-of-range numeric values from reaching conversion logic.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 partial match
prevents

Secure SDLC practices directly require code reviews, static analysis, and developer training that catch and prevent numeric type-conversion errors.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.25 Secure development life cycle partial match
prevents

Secure development lifecycle includes type-safety and conversion checks that reduce numeric truncation risks.

A.8.26 Application security requirements partial match
prevents

Application security requirements can mandate safe numeric handling and range validation.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles promote strong typing and safe conversion practices.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly address correct numeric type conversions and overflow checks.

A.8.29 Security testing in development and acceptance partial match
finds

Security testing can detect numeric conversion defects before release.

References