Windows apps · Application version · July 24, 2026

Microsoft Edge WebView2 Runtime 150.0.4078.99

Microsoft Edge WebView2 Runtime 150.0.4078.99, released July 24, 2026, fixes 6 CVEs in Microsoft Edge WebView2 Runtime. None of them is reported as exploited. Patch Radar priority: High. The latest Microsoft Edge WebView2 Runtime is 157.0.4341.42, which also fixes every one of these CVEs.

High

Superseded. The latest Microsoft Edge WebView2 Runtime is 157.0.4341.42, which also fixes every CVE on this page. Install that instead.

CVEs closed
6
None rated Critical
Exploited
0
None reported
Highest CVSS
8.8
Base score, 0 to 10
Highest EPSS
0.0052
44th percentile

Priority of the 6 CVEs

Patch now 0 Urgent 0 High 5 Routine 1

Applies to

ProductVersion
Microsoft Edge WebView2 Runtime150.0.4078.99

CVEs this fix closes

PriorityCVETitleCVSSEPSSExploitation
High CVE-2026-16806 Chromium: CVE-2026-16806 Use after free in WebMCP8.8 0.0052 None reported
High CVE-2026-57989 Microsoft Edge (Chromium-based) Information Disclosure Vulnerability7.4 0.0043 Exploitation Unlikely
High CVE-2026-16805 Chromium: CVE-2026-16805 Use after free in Blink8.8 0.0041 None reported
High CVE-2026-16807 Chromium: CVE-2026-16807 Out of bounds write in Codecs8.8 0.0035 None reported
High CVE-2026-16804 Chromium: CVE-2026-16804 Use after free in Input8.3 0.0030 None reported
Routine CVE-2026-57978 Microsoft Edge (Chromium-based) Spoofing Vulnerability5.4 0.0021 Exploitation Unlikely
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