Tampering Vulnerability in Microsoft Edge by Microsoft
CVE-2026-66317

5.4MEDIUM

Key Information:

Vendor

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

What is CVE-2026-66317?

A vulnerability exists in Microsoft Edge (Chromium-based) that allows an unauthorized attacker to exploit an origin validation error. This security flaw can lead to network tampering, potentially enabling malicious actors to manipulate data during transmission. Users of affected versions should ensure they apply the necessary updates to mitigate these risks.

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:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.