# 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.

- Web page: https://patchblox.com/security/cve/CVE-2026-42838
- Priority: Routine
- CVSS: 5.4 (Important)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- 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

## Description

<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

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Microsoft Edge | 148.0.3967.70 | [Microsoft Edge 148.0.3967.70](https://patchblox.com/security/data/fix/windows-app/microsoft.edge-148.0.3967.70.md) | May 15, 2026 |
| Windows apps | Microsoft Edge Beta | 151.0.4129.59 | [Microsoft Edge Beta 151.0.4129.59](https://patchblox.com/security/data/fix/windows-app/microsoft.edge.beta-151.0.4129.59.md) | Jul 31, 2026 |
| Windows apps | Microsoft Edge Dev | 152.0.4167.0 | [Microsoft Edge Dev 152.0.4167.0](https://patchblox.com/security/data/fix/windows-app/microsoft.edge.dev-152.0.4167.0.md) | Jul 20, 2026 |
| Windows apps | Microsoft Edge WebView2 Runtime | 148.0.3967.70 | [Microsoft Edge WebView2 Runtime 148.0.3967.70](https://patchblox.com/security/data/fix/windows-app/microsoft.edgewebview2runtime-148.0.3967.70.md) | May 15, 2026 |
| macOS | Microsoft Edge | 148.0.3967.83 | [Microsoft Edge 148.0.3967.83](https://patchblox.com/security/data/fix/macos/com.microsoft.edgemac-148.0.3967.83.md) | May 21, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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