CVE-2026-24283· NVD / CVE Program· CNA microsoft

Multiple UNC Provider Kernel Driver Elevation of Privilege Vulnerability

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

HighCVSS 8.8 · v3.1—No exploit No fix recorded

BDU:2026-02978

Published: Mar 10, 2026
Updated: Jun 19, 2026
EPSS: 0.4% · 30th percentile
CWE: CWE-122

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Action score

Monitor

Low priority for now.

CVSS: 35 / 40 · 8.8 / 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: 8.8; 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:C/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 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 23h2	cpe:2.3:o:microsoft:windows_server_2022_23h2
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 2022 23h2before 10.0.25398.2207
microsoft windows server 2025before 10.0.26100.32463

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 24H2
- 10.0.26100.0 and later · before 10.0.26100.8037affected
Microsoft Windows 11 Version 25H2
- 10.0.26200.0 and later · before 10.0.26200.8037affected
Microsoft Windows 11 version 26H1
- 10.0.28000.0 and later · before 10.0.28000.1719affected
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
- 10.0.25398.0 and later · before 10.0.25398.2207affected
Microsoft Windows Server 2025
- 10.0.26100.0 and later · before 10.0.26100.32522affected
Microsoft Windows Server 2025 (Server Core installation)
- 10.0.26100.0 and later · before 10.0.26100.32522affected

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

CVE-2025-60710Host Process for Windows Tasks Elevation of Privilege VulnerabilityKEV
62This week
CVE-2025-50165Windows Graphics Component Remote Code Execution Vulnerability
42Plan
CVE-2025-21311Windows NTLM V1 Elevation of Privilege Vulnerability
40Plan
CVE-2026-50487Windows DNS Client Elevation of Privilege Vulnerability
39Monitor
CVE-2026-62744Microsoft Windows Media Foundation Remote Code Execution Vulnerability
35Monitor
CVE-2026-85877Windows Print Spooler Remote Code Execution Vulnerability
35Monitor

Remediation

Which version to upgrade to

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

No fix version is recorded for this entry. Check the references for vendor advisories.

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-2026-54990126 days apartRemote Desktop Client Remote Code Execution Vulnerability
35Monitor
CVE-2026-62744182 days apartMicrosoft Windows Media Foundation Remote Code Execution Vulnerability
35Monitor
CVE-2026-69729182 days apartWindows Credential Providers Remote Code Execution Vulnerability
35Monitor
CVE-2026-85877182 days apartWindows Print Spooler Remote Code Execution Vulnerability
35Monitor
CVE-2026-3222135 days apartWindows Graphics Component Remote Code Execution Vulnerability
33Monitor
CVE-2026-69777182 days apartWindows DHCP Client Elevation of Privilege Vulnerability
32Monitor

Chain candidates

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

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Bug bounty scope

No known public program.

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