CVE-2026-61359· NVD / CVE Program· CNA microsoft

Windows Storage Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges locally.

HighCVSS 7.8 · v3.1—No exploit Fix available

EUVD-2026-56615

Published: Aug 11, 2026
Updated: Sep 29, 2026
EPSS: 0.3% · 24th percentile
CWE: CWE-122

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Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.3%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · microsoft: 7.8; 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:H/I:H/A:H/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.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Affected systems

Vendor	Product	CPE
microsoft	windows 11 23h2	cpe:2.3:o:microsoft:windows_11_23h2
microsoft	windows 11 24h2	cpe:2.3:o:microsoft:windows_11_24h2
microsoft	windows 11 25h2	cpe:2.3:o:microsoft:windows_11_25h2
microsoft	windows 11 26h1	cpe:2.3:o:microsoft:windows_11_26h1
microsoft	windows server 2022	cpe:2.3:o:microsoft:windows_server_2022
microsoft	windows server 2025	cpe:2.3:o:microsoft:windows_server_2025

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

microsoft windows server 2022before 10.0.20348.5440
microsoft windows server 2025before 10.0.26100.33222

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 11 version 23H2
- 10.0.22631.0 and later · before 10.0.22631.7517affected
Microsoft Windows 11 Version 23H2
- 10.0.22631.0 and later · before 10.0.22631.7517affected
Microsoft Windows 11 Version 24H2
- 10.0.26100.0 and later · before 10.0.26100.9168affected
Microsoft Windows 11 Version 25H2
- 10.0.26200.0 and later · before 10.0.26200.9168affected
Microsoft Windows 11 version 26H1
- 10.0.28000.0 and later · before 10.0.28000.2704affected
Microsoft Windows Server 2022
- 10.0.20348.0 and later · before 10.0.20348.5499affected
Microsoft Windows Server 2025
- 10.0.26100.0 and later · before 10.0.26100.33296affected
Microsoft Windows Server 2025 (Server Core installation)
- 10.0.26100.0 and later · before 10.0.26100.33296affected

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

CVE-2026-81963Windows Update Stack Elevation of Privilege VulnerabilityKEV
61This week
CVE-2026-62815Microsoft QUIC Remote Code Execution Vulnerability
39Monitor
CVE-2026-45657Windows Kernel Remote Code Execution Vulnerability
39Monitor
CVE-2026-41096Windows DNS Client Remote Code Execution Vulnerability
39Monitor
CVE-2025-9491Microsoft Windows LNK File UI Misrepresentation Remote Code Execution Vulnerability
39Monitor
CVE-2026-40402Windows Hyper-V Elevation of Privilege Vulnerability
37Monitor

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 11 Version 23H2 for ARM64-based Systems	10.0.22631.7517 · KB5120240	Microsoft (MSRC)
Windows 11 Version 23H2 for x64-based Systems	10.0.22631.7517 · KB5120240	Microsoft (MSRC)
Windows 11 Version 24H2 for ARM64-based Systems	10.0.26100.9106 · KB5120994	Microsoft (MSRC)
Windows 11 Version 24H2 for ARM64-based Systems	10.0.26100.9168 · KB5121003	Microsoft (MSRC)
Windows 11 Version 24H2 for x64-based Systems	10.0.26100.9106 · KB5120994	Microsoft (MSRC)
Windows 11 Version 24H2 for x64-based Systems	10.0.26100.9168 · KB5121003	Microsoft (MSRC)
Windows 11 Version 25H2 for ARM64-based Systems	10.0.26200.9106 · KB5120994	Microsoft (MSRC)
Windows 11 Version 25H2 for ARM64-based Systems	10.0.26200.9168 · KB5121003	Microsoft (MSRC)
Windows 11 Version 25H2 for x64-based Systems	10.0.26200.9106 · KB5120994	Microsoft (MSRC)
Windows 11 Version 25H2 for x64-based Systems	10.0.26200.9168 · KB5121003	Microsoft (MSRC)
Windows 11 Version 26H1 for ARM64-based Systems	10.0.28000.2704 · KB5121000	Microsoft (MSRC)
Windows 11 version 26H1 for x64-based Systems	10.0.28000.2704 · KB5121000	Microsoft (MSRC)
Windows Server 2022	10.0.20348.5440 · KB5120229	Microsoft (MSRC)
Windows Server 2022	10.0.20348.5499 · KB5120242	Microsoft (MSRC)
Windows Server 2022 (Server Core installation)	10.0.20348.5440 · KB5120229	Microsoft (MSRC)
Windows Server 2022 (Server Core installation)	10.0.20348.5499 · KB5120242	Microsoft (MSRC)
Windows Server 2025	10.0.26100.33222 · KB5120228	Microsoft (MSRC)
Windows Server 2025	10.0.26100.33296 · KB5120233	Microsoft (MSRC)
Windows Server 2025 (Server Core installation)	10.0.26100.33222 · KB5120228	Microsoft (MSRC)
Windows Server 2025 (Server Core installation)	10.0.26100.33296 · KB5120233	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.

No dated events beyond publication.

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-2026-4565763 days apartWindows Kernel Remote Code Execution Vulnerability
39Monitor
CVE-2026-4109691 days apartWindows DNS Client Remote Code Execution Vulnerability
39Monitor
CVE-2026-7294028 days apartWindows Schannel Remote Code Execution Vulnerability
35Monitor
CVE-2025-62456245 days apartWindows Resilient File System (ReFS) Remote Code Execution Vulnerability
35Monitor
CVE-2026-4765263 days apartWindows Hyper-V Remote Code Execution Vulnerability
32Monitor
CVE-2026-628110 days apartWindows HTTP.sys Elevation of Privilege Vulnerability
31Monitor

Chain candidates

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

—

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: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

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

Weakness class (CWE)

CWE-122 · Heap-based Buffer Overflow

CVSS vector

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

nvd-secondary

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)

Forced Integer OverflowCAPEC-92likelihood: High · High

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:07 PM UTC

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

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-61359

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

All records

Noroxi analysis

No Noroxi analysis for this record yet

We use this product, ask for help

Data sources and verification

CNA: microsoft

CVE.org (CNA)Sep 29, 2026, 8:21 PM UTC
CISA ADPSep 29, 2026, 8:21 PM UTC
NVDSep 29, 2026, 8:21 PM UTC
FIRST EPSSSep 29, 2026, 12:00 AM UTC
MSRCSep 28, 2026, 10:04 PM UTC

Each line is when that source was last processed for this record.

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