CVE-2026-66316: Microsoft Edge (Chromium-based) Spoofing Vulnerability
Published Jul 31, 2026
·Updated
Microsoft Edge (Chromium-based) Spoofing Vulnerability
Other sources
Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.
— Microsoft
Affected Software
3 affected componentsFixes available
Microsoft Edge (Chromium-based)<151.0.4129.59
151.0.4129.59
Microsoft Edge<151.0.4129.59
Microsoft Edge Chromium<151.0.4129.59
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 151.0.4129.59
Event History
Jul 31, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
Updated
via Microsoft·02:00 PM
DescriptionAffected Software
Aug 3, 2026
CVE Published
via MITRE·10:53 PM
Data Sourced
via MITRE·10:53 PM
DescriptionSeverity
Aug 4, 2026
Data Sourced
via NVD·12:17 AM
DescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-66316?
CVE-2026-66316 has a medium severity rating of 5.4.
2
How do I fix CVE-2026-66316?
To fix CVE-2026-66316, ensure that you update your Microsoft Edge (Chromium-based) to the latest version.
3
What kind of vulnerability is CVE-2026-66316?
CVE-2026-66316 is a spoofing vulnerability that arises from an origin validation error in Microsoft Edge.
4
Who is affected by CVE-2026-66316?
Users of Microsoft Edge (Chromium-based) are affected by CVE-2026-66316.
5
Can CVE-2026-66316 be exploited remotely?
Yes, CVE-2026-66316 can be exploited over a network by an unauthorized attacker.