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CVE-2026-50339: Windows Push Notifications can leak sensitive information

CVE-2026-50339 · published 3 months ago

Summary

An attacker can access sensitive information on a Windows device through Windows Push Notifications. This is a concern because it allows unauthorized access to personal data. To mitigate this risk, ensure that Windows updates are applied regularly.

What to do

Update microsoft windows 10 version 1809 to version 10.0.17763.9020 or later.
Update microsoft windows 10 version 21h2 to version 10.0.19044.7548 or later.
Update microsoft windows 10 version 22h2 to version 10.0.19045.7548 or later.
Update microsoft windows 11 version 24h2 to version 10.0.26100.8875 or later.
Update microsoft windows 11 version 25h2 to version 10.0.26200.8875 or later.
Update microsoft windows server 2019 to version 10.0.17763.9020 or later.
Update microsoft windows server 2019 (server core installation) to version 10.0.17763.9020 or later.
Update microsoft windows server 2022 to version 10.0.20348.5386 or later.
Update microsoft windows server 2025 to version 10.0.26100.33158 or later.
Update microsoft windows server 2025 (server core installation) to version 10.0.26100.33158 or later.
Update microsoft windows_10_1809 to version 10.0.17763.9020 or later.
Update microsoft windows_10_21h2 to version 10.0.19044.7548 or later.
Update microsoft windows_10_22h2 to version 10.0.19045.7548 or later.
Update microsoft windows_11_24h2 to version 10.0.26100.8875 or later.
Update microsoft windows_11_25h2 to version 10.0.26200.8875 or later.
Update microsoft windows_server_2019 to version 10.0.17763.9020 or later.
Update microsoft windows_server_2022 to version 10.0.20348.5386 or later.
Update microsoft windows_server_2025 to version 10.0.26100.33158 or later.

Affected software

Vendor	Product	Affected versions
microsoft	windows 10 version 1809	< 10.0.17763.9020
microsoft	windows 10 version 21h2	< 10.0.19044.7548
microsoft	windows 10 version 22h2	< 10.0.19045.7548
microsoft	windows 11 version 24h2	< 10.0.26100.8875
microsoft	windows 11 version 25h2	< 10.0.26200.8875
microsoft	windows 11 version 26h1	< 10.0.28000.2269 < 10.0.28000.2525
microsoft	windows server 2019	< 10.0.17763.9020
microsoft	windows server 2019 (server core installation)	< 10.0.17763.9020
microsoft	windows server 2022	< 10.0.20348.5386
microsoft	windows server 2025	< 10.0.26100.33158
microsoft	windows server 2025 (server core installation)	< 10.0.26100.33158
microsoft	windows_10_1809	< 10.0.17763.9020 `cpe:2.3:o:microsoft:windows_10_1809:::::::x64:*`
microsoft	windows_10_21h2	< 10.0.19044.7548 `cpe:2.3:o:microsoft:windows_10_21h2:::::::arm64:*`
microsoft	windows_10_22h2	< 10.0.19045.7548 `cpe:2.3:o:microsoft:windows_10_22h2:::::::arm64:*`
microsoft	windows_11_24h2	< 10.0.26100.8875 `cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:*`
microsoft	windows_11_25h2	< 10.0.26200.8875 `cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:*`
microsoft	windows_11_26h1	< 10.0.28000.2269 < 10.0.28000.2525 `cpe:2.3:o:microsoft:windows_11_26h1:::::::x64:*`
microsoft	windows_server_2019	< 10.0.17763.9020 `cpe:2.3:o:microsoft:windows_server_2019::::::::`
microsoft	windows_server_2022	< 10.0.20348.5386 `cpe:2.3:o:microsoft:windows_server_2022::::::::`
microsoft	windows_server_2025	< 10.0.26100.33158 `cpe:2.3:o:microsoft:windows_server_2025::::::::`

Original advisory text

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.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50339 vendor-advisory patch

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker partial control

Severity

5.5 Medium

Exploitation

<1% chance of attack within 30 days

Type

CWE-200Information Exposure

Timeline

Published14 Jul 2026

Updated4 Nov 2026

First seen14 Jul 2026

Sources

CVE-2026-50339 · NVD

CVE-2026-50339 · MITRE

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