High severity · published Oct 29, 2026
CVE-2026-85899
Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability
New
8.1
CVSS
–
EPSS
No
On KEV
Description
Use after free in Microsoft Edge (Chromium-based) allows an authorized attacker to elevate privileges over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
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 155.0.4283.45 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-85899
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-85899
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85899
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