Tampering Vulnerability in Microsoft Edge by Microsoft
CVE-2026-66311

6.2MEDIUM

Key Information:

Vendor

Microsoft
Status
Microsoft Edge (chromium-based)
Vendor
CVE Published:
3 August 2026

What is CVE-2026-66311?

A security issue in Microsoft Edge (Chromium-based) permits an attacker to execute unauthorized actions locally due to missing authorization checks. This flaw exposes users to potential tampering, where malicious entities could compromise the integrity of browser components and user data. Users are encouraged to apply patches promptly to mitigate the risk posed by this vulnerability.

Affected Version(s)

Microsoft Edge (Chromium-based) 1.0.0.0 < 151.0.4129.59

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
6.2
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.