CVE-2026-42838

Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability

CVE-2026-42838 is fixed in 4 products on 2 platforms, first by Microsoft Edge 148.0.3967.70, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.

RoutineFixed on 2 platforms

CVSS

5.4

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0024

15th percentile

<p>Improper neutralization of special elements in output used by a downstream component ('injection') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to elevate privileges over a network.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
Microsoft Edge	148.0.3967.70	Microsoft Edge 148.0.3967.70	May 15, 2026
Microsoft Edge Beta	151.0.4129.59	Microsoft Edge Beta 151.0.4129.59	Jul 31, 2026
Microsoft Edge Dev	152.0.4167.0	Microsoft Edge Dev 152.0.4167.0	Jul 20, 2026
Microsoft Edge WebView2 Runtime	148.0.3967.70	Microsoft Edge WebView2 Runtime 148.0.3967.70	May 15, 2026
macOS
Microsoft Edge	148.0.3967.83	Microsoft Edge 148.0.3967.83	May 21, 2026

Details

Published
May 11, 2026
Weakness
Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42838

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