High severity · published Aug 3, 2026
CVE-2026-66312
Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
8.8
CVSS
1.1%
EPSS
No
On KEV
Description
Buffer over-read in Microsoft Edge (Chromium-based) allows an authorized attacker to execute code over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 65% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ME
Microsoft Edge (Chromium-based) · Microsoft
1.0.0.0 before 151.0.4129.59 · source: vendor
EC
Edge Chromium · Microsoft
before 151.0.4129.59 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-66312
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-66312
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66312
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