Medium severity · published Aug 28, 2026
CVE-2026-66323
Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
5.4
CVSS
0.4%
EPSS
No
On KEV
Description
Improper neutralization of parameter/argument delimiters in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ME
Microsoft Edge for Android · Microsoft
1.0.0.0 before 152.0.4191.52 · source: vendor
ME
Microsoft Edge for Linux · Microsoft
1.0.0 before 152.0.4191.52 · source: vendor
ME
Microsoft Edge for MAC · Microsoft
1.0.0.0 before 152.0.4191.52 · source: vendor
ME
Microsoft Edge for Windows · Microsoft
1.0.0.0 before 152.0.4191.52 · source: vendor
ME
Microsoft Edge for iOS · Microsoft
1.0.0.0 before 152.0.4191.52 · source: vendor
EC
Edge Chromium · Microsoft
before 152.0.4191.53 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-66323
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-66323
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66323
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