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CVE-2026-68850: Microsoft Account Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.8 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: 2026-09-08 · updated 2026-10-31
• Weakness: CWE-122

Description

Heap-based buffer overflow in Microsoft Account allows an authorized attacker to elevate privileges locally.

Affected products

• Microsoft Windows 11: before 10.0.26100.9445 — fixed in 10.0.26100.9445
• Microsoft Windows 11 25H2: before 10.0.26200.9445 — fixed in 10.0.26200.9445
• Microsoft Windows Server 2025: before 10.0.26100.33438 — fixed in 10.0.26100.33438
• Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.9445 — fixed in 10.0.26100.9445
• Microsoft Windows 11 25H2: from 10.0.26200.0 before 10.0.26200.9445 — fixed in 10.0.26200.9445
• Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.33438 — fixed in 10.0.26100.33438

How to fix

Upgrade to a fixed version: Microsoft Windows 11 10.0.26100.9445; Microsoft Windows 11 25H2 10.0.26200.9445; Microsoft Windows Server 2025 10.0.26100.33438; Microsoft Windows 11 10.0.26100.9445; Microsoft Windows 11 25H2 10.0.26200.9445; Microsoft Windows Server 2025 10.0.26100.33438. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68850

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