CVE-2026-56173: Windows WebView Elevation of Privilege Vulnerability
Use after free in Windows WebView allows an authorized attacker to elevate privileges locally.
Other sources
Windows WebView Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19044.7548Patch KB5099539 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19045.7548Patch KB5099539 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33158Patch KB5099536 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9020Patch KB5099538 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5386Patch KB5099540 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.2525Patch KB5101649 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.8875Patch KB5101650 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7376Patch KB5099414 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.8875Patch KB5101650
Event History
Frequently Asked Questions
What is the severity of CVE-2026-56173?
The severity of CVE-2026-56173 is rated high with a score of 7.
How do I fix CVE-2026-56173?
To fix CVE-2026-56173, ensure that you apply the latest security updates from Microsoft for your version of Windows.
What software is affected by CVE-2026-56173?
CVE-2026-56173 affects Microsoft Windows 10, Windows 11, and several versions of Windows Server.
What type of vulnerability is CVE-2026-56173?
CVE-2026-56173 is classified as a Use After Free vulnerability that allows local privilege elevation.
Can CVE-2026-56173 be exploited remotely?
No, CVE-2026-56173 requires local access, as it allows an authorized attacker to elevate privileges locally.