Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
CVE-2026-66323 is fixed in 4 products on 2 platforms, first by Microsoft Edge Dev 153.0.4224.0, released August 17, 2026. 1 other affected product has no fix yet. It is not reported as exploited. Patch Radar priority: Routine.
<p>Improper neutralization of parameter/argument delimiters in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.</p>
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Microsoft Edge | 152.0.4191.66 | Microsoft Edge 152.0.4191.66 | Sep 4, 2026 |
| Microsoft Edge Beta | 153.0.4234.6 | Microsoft Edge Beta 153.0.4234.6 | Aug 27, 2026 |
| Microsoft Edge Dev | 153.0.4224.0 | Microsoft Edge Dev 153.0.4224.0 | Aug 17, 2026 |
| Microsoft Edge WebView2 Runtime | 152.0.4191.53 | Microsoft Edge WebView2 Runtime 152.0.4191.53 | Aug 28, 2026 |
| macOS | |||
| Microsoft Edge | 152.0.4191.53 | Microsoft Edge 152.0.4191.53 | Aug 27, 2026 |
| No fix yet | |||
| Local Administrator Password Solution (Windows apps) | No fix yet | no-fix | n/a |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.