# CVE-2026-20942: Microsoft Edge (Chromium-based) Spoofing Vulnerability

CVE-2026-20942 is fixed in 4 products on 2 platforms, first by Microsoft Edge Dev 157.0.4322.0, released October 6, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-20942
- Priority: Routine
- CVSS: 4.3 (Low)
- EPSS: 0.0063
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Oct 27, 2026
- Weakness: Improper Restriction of Rendered UI Layers or Frames
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20942

## Description

<p>Improper restriction of rendered ui layers or frames in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Microsoft Edge | 156.0.4314.42 | [Microsoft Edge 156.0.4314.42](https://patchblox.com/security/data/fix/windows-app/microsoft.edge-156.0.4314.42.md) | Oct 22, 2026 |
| Windows apps | Microsoft Edge Beta | 157.0.4341.10 | [Microsoft Edge Beta 157.0.4341.10](https://patchblox.com/security/data/fix/windows-app/microsoft.edge.beta-157.0.4341.10.md) | Oct 20, 2026 |
| Windows apps | Microsoft Edge Dev | 157.0.4322.0 | [Microsoft Edge Dev 157.0.4322.0](https://patchblox.com/security/data/fix/windows-app/microsoft.edge.dev-157.0.4322.0.md) | Oct 6, 2026 |
| Windows apps | Microsoft Edge WebView2 Runtime | 156.0.4314.42 | [Microsoft Edge WebView2 Runtime 156.0.4314.42](https://patchblox.com/security/data/fix/windows-app/microsoft.edgewebview2runtime-156.0.4314.42.md) | Oct 22, 2026 |
| macOS | Microsoft Edge | 156.0.4314.42 | [Microsoft Edge 156.0.4314.42](https://patchblox.com/security/data/fix/macos/com.microsoft.edgemac-156.0.4314.42.md) | Oct 21, 2026 |

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Data as of 2026-11-09T01:18:40Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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