CVE-2026-62779: Windows Schannel Elevation of Privilege Vulnerability

highCVSS 7.8CVE-2026-62779

Use after free in Windows Schannel allows an authorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoft product: Windows Schannel Privilege escalation Memory corruption

What: Use-after-free in Windows Schannel allows local privilege escalation.
Who is affected: Authorized local attackers on Windows systems.
Urgency: High severity (CVSS 7.8); Schannel is core to TLS/SSL, making this critical infrastructure risk.
Action: Apply the latest Windows security update addressing CVE-2026-62779.

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

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.8
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62779

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-2026-627790.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 15% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-62779	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Windows Schannel Elevation

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-62779: Use after free in Windows Schannel allows an authorized attacker to elevate privileges locally…nvd · 2026-08-11