CVE-2026-34342: Windows Print Spooler Elevation of Privilege Vulnerability

Severity: high (CVSS 7.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-12 · updated 2026-08-10
Weakness: CWE-362

Description

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

Affected products

Microsoft Windows 10 1607: before 10.0.14393.9140 — fixed in 10.0.14393.9140
Microsoft Windows 10: before 10.0.17763.8755 — fixed in 10.0.17763.8755
Microsoft Windows 10: before 10.0.19044.7291 — fixed in 10.0.19044.7291
Microsoft Windows 10: before 10.0.19045.7291 — fixed in 10.0.19045.7291
Microsoft Windows 11: before 10.0.22631.7079 — fixed in 10.0.22631.7079
Microsoft Windows 11: before 10.0.26100.8390 — fixed in 10.0.26100.8390
Microsoft Windows 11 25H2: before 10.0.26200.8390 — fixed in 10.0.26200.8390
Microsoft Windows 11 version 26H1: before 10.0.28000.2113 — fixed in 10.0.28000.2113
Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: before 10.0.14393.9140 — fixed in 10.0.14393.9140
Microsoft Windows Server 2019: before 10.0.17763.8755 — fixed in 10.0.17763.8755
Microsoft Windows Server 2022: before 10.0.20348.5074 — fixed in 10.0.20348.5074
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.2330 — fixed in 10.0.25398.2330
Microsoft Windows Server 2025: before 10.0.26100.32772 — fixed in 10.0.26100.32772
Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.9140 — fixed in 10.0.14393.9140
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.8755 — fixed in 10.0.17763.8755
Microsoft Windows 10: from 10.0.19044.0 before 10.0.19044.7291 — fixed in 10.0.19044.7291
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.7417 — fixed in 10.0.19045.7417
Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.7079 — fixed in 10.0.22631.7079
Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.8457 — fixed in 10.0.26100.8457
Microsoft Windows 11 25H2: from 10.0.26200.0 before 10.0.26200.8457 — fixed in 10.0.26200.8457
Microsoft Windows 11 version 26H1: from 10.0.28000.0 before 10.0.28000.2113 — fixed in 10.0.28000.2113
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.26079 — fixed in 6.2.9200.26079
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.23181 — fixed in 6.3.9600.23181
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.9140 — fixed in 10.0.14393.9140
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.8755 — fixed in 10.0.17763.8755
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.5139 — fixed in 10.0.20348.5139
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.2330 — fixed in 10.0.25398.2330
Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.32860 — fixed in 10.0.26100.32860

How to fix

Upgrade to a fixed version: Microsoft Windows 10 1607 10.0.14393.9140; Microsoft Windows 10 10.0.17763.8755; Microsoft Windows 10 10.0.19044.7291; Microsoft Windows 10 10.0.19045.7291; Microsoft Windows 11 10.0.22631.7079; Microsoft Windows 11 10.0.26100.8390; Microsoft Windows 11 25H2 10.0.26200.8390; Microsoft Windows 11 version 26H1 10.0.28000.2113; Microsoft Windows Server 2016 10.0.14393.9140; Microsoft Windows Server 2019 10.0.17763.8755; Microsoft Windows Server 2022 10.0.20348.5074; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2330. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34342

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