CVE-2026-62738 — Windows Management Instrumentation Information Disclosure Vulnerability

Executive Summary

Out-of-bounds read in Windows Management Instrumentation allows an authorized attacker to disclose information locally.

Overview

5.5

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Information Disclosure

Released Aug 11 2026

Last Updated Aug 11 2026

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.00387 — 0.31806 percentile

NVD CVSS 5.5 MEDIUM — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Local

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

None

AVAILABILITY

None

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 4.8

EPSS Score

0.00387

probability of exploitation in the next 30 days

0.31806 percentile - updated 2026-08-14

View on FIRST.org

Affected Products

22 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 1607 for 32-bit Systems	`5120418 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1607 for x64-based Systems	`5120418 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for 32-bit Systems	`5120238 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for x64-based Systems	`5120238 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 21H2 for 32-bit Systems	`5120249 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 21H2 for ARM64-based Systems	`5120249 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 21H2 for x64-based Systems	`5120249 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 22H2 for 32-bit Systems	`5120249 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 22H2 for ARM64-based Systems	`5120249 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 22H2 for x64-based Systems	`5120249 (Security Update)`	Important	Information Disclosure	Yes
Windows 11 Version 23H2 for ARM64-based Systems	`5120240 (Security Update)`	Important	Information Disclosure	Yes
Windows 11 Version 23H2 for x64-based Systems	`5120240 (Security Update)`	Important	Information Disclosure	Yes
Windows 11 Version 24H2 for ARM64-based Systems 5120994 (Security Hotpatch Update) 5121003 (Security Update) Important Information Disclosure 5101650 Base: 5.5 Temporal: 4.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C 10.0.26100.9106 10.0.26100.9168 Yes None Windows 11 Version 24H2 for x64-based Systems 5121003 (Security Update) 5120994 (Security Hotpatch Update) Important Information Disclosure 5101650 Base: 5.5 Temporal: 4.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C 10.0.26100.9168 10.0.26000.9106 Yes None Windows 11 Version 25H2 for ARM64-based Systems 5121003 (Security Update) 5120994 (Security Hotpatch Update) Important Information Disclosure 5101650 Base: 5.5 Temporal: 4.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C 10.0.26200.9168 10.0.26100.9106 Yes None Windows 11 Version 25H2 for x64-based Systems 5121003 (Security Update) 5120994 (Security Hotpatch Update) Important Information Disclosure 5101650 Base: 5.5 Temporal: 4.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C 10.0.26200.9168 10.0.26100.9106 Yes None Windows 11 Version 26H1 for ARM64-based Systems	`5121000 (Security Update)`	Important	Information Disclosure	Yes
Windows 11 version 26H1 for x64-based Systems	`5121000 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2012	`5120386 (Monthly Rollup)`	Important	Information Disclosure	Yes
Windows Server 2012 (Server Core installation)	`5120386 (Monthly Rollup)`	Important	Information Disclosure	Yes
Windows Server 2012 R2	`5120385 (Monthly Rollup)`	Important	Information Disclosure	Yes
Windows Server 2012 R2 (Server Core installation)	`5120385 (Monthly Rollup)`	Important	Information Disclosure	Yes
Windows Server 2016	`5120418 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2016 (Server Core installation)	`5120418 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2019	`5120238 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2019 (Server Core installation)	`5120238 (Security Update)`	Important	Information Disclosure	Yes

Patches

7 patches

Article	Type	Restart
`5120418`	Security Update	Yes
`5120238`	Security Update	Yes
`5120249`	Security Update	Yes
`5120240`	Security Update	Yes
`5121000`	Security Update	Yes
`5120386`	Monthly Rollup	Yes
`5120385`	Monthly Rollup	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

41ae55e9310ff27fa6f26af4727e5590
Pwnforr777

References

MSRC Advisory MITRE NVD