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CVE-2026-66798Important

Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

MSRC advisory NVD CVE.org

Assessment

Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

Severity
Important
CVSS base score
4.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C
Impact
Remote Code Execution
EPSS, next 30 days
0.8%Higher than 54.3% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
Exploitability
Exploitation Unlikely
Publicly disclosed
No
Customer action
Required: apply the update
Component
Microsoft Edge (Chromium-based)
Weakness
CWE-416: Use After Free
Issued by
Microsoft
Published
28 Aug 2026 · August 2026
Last revised
28 Aug 2026

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

Browser
6 affected products
  • Microsoft Edge (Chromium-based)
  • Microsoft Edge for Android
  • Microsoft Edge for iOS
  • Microsoft Edge for Linux
  • Microsoft Edge for MAC
  • Microsoft Edge for Windows
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