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CVE-2026-20926

HIGHCVSS 7.5/10EPSS 0.78%

Last modified

CVE-2026-20926 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.. EPSS estimates a 0.78% chance of exploitation in the next 30 days.

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.

Metrics

CVSS 3.1
7.5/10

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

EPSS Probability
0.78%

51.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
MicrosoftWindows 10 1607< 10.0.14393.8783
MicrosoftWindows 10 1809< 10.0.17763.8276
MicrosoftWindows 10 21h2< 10.0.19044.6809
MicrosoftWindows 10 22h2< 10.0.19045.6809
MicrosoftWindows 11 23h2< 10.0.22631.6491
MicrosoftWindows 11 24h2< 10.0.26100.7623
MicrosoftWindows 11 25h2< 10.0.26200.7623
MicrosoftWindows Server 2012All versions
MicrosoftWindows Server 2012r2
MicrosoftWindows Server 2016< 10.0.14393.8783
MicrosoftWindows Server 2019< 10.0.17763.8276
MicrosoftWindows Server 2022< 10.0.20348.4648
MicrosoftWindows Server 2022 23h2< 10.0.25398.2092
MicrosoftWindows Server 2025< 10.0.26100.32230

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-20926?
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
How severe is CVE-2026-20926?
CVE-2026-20926 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.78% probability of exploitation in the next 30 days.
How do I fix CVE-2026-20926?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-20926?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST