CVE-2026-42836

highCVSS 7covered by 1 sourcefirst seen 2026-06-09

Concurrent execution using shared resource with improper synchronization ('race condition') in Function Discovery Service (fdwsd.dll) allows an authorized attacker to elevate privileges locally.

CSIRTS triage

What: Concurrent execution using shared resource with improper synchronization in Function Discovery Service allows an authorized attacker to elevate privileges locally.
Who is affected: Authorized users of the Function Discovery Service.
Urgency: Remediation is important due to the high severity of the vulnerability.
Action: Apply the security patch from Microsoft.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Low exploitation risk0.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.

Advisory coverage (1)

highCVE-2026-42836: Windows Function Discovery Service (fdwsd.dll) Elevation of Privilege Vulnerabilitymsrc · 2026-06-09

External references

NVD record for CVE-2026-42836

CVE.org record

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