CVE-2026-69621: Role: Windows Fax Service Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows Fax Service allows an authorized attacker to elevate privileges locally.
Other sources
Role: Windows Fax Service Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
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Fixed in 6.3.9600.23397Patch KB5123066 - Upgrade
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Fixed in 10.0.14393.9512Patch KB5123099 - Upgrade
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Fixed in 6.2.9200.26349Patch KB5123065 - Upgrade
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Fixed in 10.0.28000.2954Patch KB5124012 - Upgrade
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Fixed in 10.0.26100.33438Patch KB5122871 - Upgrade
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Fixed in 10.0.22631.7582Patch KB5122880 - Upgrade
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Fixed in 10.0.26100.9445Patch KB5124008 - Upgrade
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Fixed in 10.0.26200.9445Patch KB5124008 - Upgrade
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Fixed in 10.0.19045.7725Patch KB5122878 - Upgrade
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Fixed in 10.0.19044.7725Patch KB5122878 - Upgrade
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Fixed in 10.0.20348.5622Patch KB5122882 - Upgrade
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Fixed in 10.0.17763.9245Patch KB5122876
Event History
Frequently Asked Questions
What access does an attacker need to exploit this issue?
An attacker must already be authorized on the affected system and exploit the flaw locally. The provided data does not indicate that remote, unauthenticated exploitation is possible.
Which systems should be assessed for exposure?
Assess Windows 10, Windows 11, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025 systems that use the Windows Fax Service.
What is the potential impact of successful exploitation?
Successful exploitation can allow a local authorized attacker to elevate privileges. The supplied severity vector indicates potential high impact to confidentiality, integrity, and availability.