CVE-2026-50434· NVD / CVE Program· CNA microsoft

Windows Push Notification Information Disclosure Vulnerability

Exposure of sensitive information to an unauthorized actor in Windows Push Notifications allows an authorized attacker to disclose information locally.

MediumCVSS 5.5 · v3.1—No exploit Fix available

Info leak

EUVD-2026-43883

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Published: Jul 14, 2026
Updated: Sep 25, 2026
EPSS: 0.5% · 39th percentile
CWE: CWE-200

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Action score

Monitor

Low priority for now.

CVSS: 22 / 40 · 5.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.5%

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:H/I:N/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.

Affected systems

Vendor	Product	CPE
microsoft	windows 10 21h2	cpe:2.3:o:microsoft:windows_10_21h2
microsoft	windows 10 22h2	cpe:2.3:o:microsoft:windows_10_22h2
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 10.0.20348.5386
microsoft windows server 2025before 10.0.26100.33158

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 21H2
- 10.0.19044.0 and later · before 10.0.19044.7548affected
Microsoft Windows 10 Version 22H2
- 10.0.19045.0 and later · before 10.0.19045.7548affected
Microsoft Windows 11 Version 24H2
- 10.0.26100.0 and later · before 10.0.26100.8875affected
Microsoft Windows 11 Version 25H2
- 10.0.26200.0 and later · before 10.0.26200.8875affected
Microsoft Windows 11 version 26H1
- 10.0.28000.0 and later · before 10.0.28000.2525affected
Microsoft Windows Server 2022
- 10.0.20348.0 and later · before 10.0.20348.5386affected
Microsoft Windows Server 2025
- 10.0.26100.0 and later · before 10.0.26100.33158affected
Microsoft Windows Server 2025 (Server Core installation)
- 10.0.26100.0 and later · before 10.0.26100.33158affected

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

CVE-2025-21333Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege VulnerabilityKEV
64This week
CVE-2025-21335Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege VulnerabilityKEV
61This week
CVE-2025-21334Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege VulnerabilityKEV
61This week
CVE-2023-38186Windows Mobile Device Management Elevation of Privilege Vulnerability
39Monitor
CVE-2026-42904Windows TCP/IP Elevation of Privilege Vulnerability
38Monitor
CVE-2023-38148Internet Connection Sharing (ICS) Remote Code Execution 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 10 Version 21H2 for 32-bit Systems	10.0.19044.7548 · KB5099539	Microsoft (MSRC)
Windows 10 Version 21H2 for ARM64-based Systems	10.0.19044.7548 · KB5099539	Microsoft (MSRC)
Windows 10 Version 21H2 for x64-based Systems	10.0.19044.7548 · KB5099539	Microsoft (MSRC)
Windows 10 Version 22H2 for 32-bit Systems	10.0.19045.7548 · KB5099539	Microsoft (MSRC)
Windows 10 Version 22H2 for ARM64-based Systems	10.0.19045.7548 · KB5099539	Microsoft (MSRC)
Windows 10 Version 22H2 for x64-based Systems	10.0.19045.7548 · KB5099539	Microsoft (MSRC)
Windows 11 Version 24H2 for ARM64-based Systems	10.0.26100.8875 · KB5101650	Microsoft (MSRC)
Windows 11 Version 24H2 for x64-based Systems	10.0.26100.8875 · KB5101650	Microsoft (MSRC)
Windows 11 Version 25H2 for ARM64-based Systems	10.0.26200.8875 · KB5101650	Microsoft (MSRC)
Windows 11 Version 25H2 for x64-based Systems	10.0.26200.8875 · KB5101650	Microsoft (MSRC)
Windows 11 Version 26H1 for ARM64-based Systems	10.0.28000.2525 · KB5101649	Microsoft (MSRC)
Windows 11 version 26H1 for x64-based Systems	10.0.28000.2525 · KB5101649	Microsoft (MSRC)
Windows Server 2022	10.0.20348.5386 · KB5099540	Microsoft (MSRC)
Windows Server 2025	10.0.26100.33158 · KB5099536	Microsoft (MSRC)
Windows Server 2025 (Server Core installation)	10.0.26100.33158 · KB5099536	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-2025-64670217 days apartWindows DirectX Information Disclosure Vulnerability
26Monitor
CVE-2026-503500 days apartWindows Trusted Runtime Interface Driver Information Disclosure Vulnerability
22Monitor
CVE-2026-561840 days apartWin32k Information Disclosure Vulnerability
22Monitor
CVE-2026-4290635 days apartWindows Shell Information Disclosure Vulnerability
22Monitor

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: none
Availability: none

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

Weakness class (CWE)

CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor

CVSS vector

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

nvd-secondary

Root cause

The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.

The bug in code

The whole CWE-200 class

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

Vulnerable

json

1{2  "permissions": ["tabs", "<all_urls>"],3  "background": { "service_worker": "analytics.js" }4}

Fixed

json

1{2  "permissions": ["activeTab"],3  "host_permissions": ["https://yildiz.example/*"]4}

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)

ATT&CK techniques

Change log

Fix✗ → ✓Sep 30, 2026, 3:32 AM UTC

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

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50434

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

All records

Noroxi analysis

No Noroxi analysis for this record yet

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Data sources and verification

CNA: microsoft

CVE.org (CNA)Sep 25, 2026, 6:21 PM UTC
CISA ADPSep 25, 2026, 6:21 PM UTC
NVDSep 25, 2026, 6:21 PM UTC
FIRST EPSSSep 29, 2026, 12:00 AM UTC
MSRCSep 30, 2026, 3:25 AM UTC

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

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