Is CVE-2026-42977 in the CISA KEV catalog?

No. CVE-2026-42977 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-42977?

CVE-2026-42977 has a CVSS v3 base score of 7.8 (Important).

What is the EPSS score for CVE-2026-42977?

CVE-2026-42977 has an EPSS score of 0.18% (8th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42977?

Install KB5094123 for Windows 10 Version 1809. Fixes are available for 14 affected products.

CVE & CISA-KEV Catalog

CVE-2026-42977

HIGH

7.8

CVSS v3

NVD

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Push Notifications allows an authorized attacker to elevate privileges locally.

CWE-362Race Condition

How to fix

Remediation Available

Windows 10 Version 1809Windows

Install:KB5094123Microsoft

Windows 10 Version 21H2Windows

Install:KB5094127Microsoft

Windows 10 Version 22H2Windows

Install:KB5094127Microsoft

Windows 11 Version 23H2Windows

Install:KB5093998Microsoft

Windows 11 Version 24H2Windows

Install:KB5094126Microsoft

Windows 11 Version 25H2Windows

Install:KB5094126Microsoft

Windows 11 Version 26H1Windows

Install:KB5095051Microsoft

Windows 11 version 26H1Windows

Install:KB5095051Microsoft

Windows Server 2019Windows

Install:KB5094123Microsoft

Windows Server 2019 (Server Core installation)Windows

Install:KB5094123Microsoft

Windows Server 2022Windows

Install:KB5094128Microsoft

Windows Server 2022 (Server Core installation)Windows

Install:KB5094128Microsoft

Windows Server 2025Windows

Install:KB5094125Microsoft

Windows Server 2025 (Server Core installation)Windows

Install:KB5094125Microsoft

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.18%probability of exploitation in 30 days

8thpercentile

Low risk: more likely to be exploited than 8% of all known CVEs.

References

Vendor Advisory1

msrc.microsoft.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-10.