CVE-2026-62799: Windows SMB Client Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows SMB Client allows an authorized attacker to elevate privileges locally.
CSIRTS triage
- What
- A heap-based buffer overflow in Windows SMB Client enables local privilege escalation.
- Who is affected
- Authorized local users on systems connecting to untrusted SMB shares.
- Urgency
- High priority; privilege escalation vector affects all Windows systems using SMB and requires prompt patching.
- Action
- Apply Windows updates addressing CVE-2026-62799 when available.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62799
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-627990.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-62799 | coverage & exploitation status | NVD · CVE.org |
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