CVE-2026-66313: Microsoft Edge (Chromium-based) Tampering Vulnerability
Published Jul 31, 2026
·Updated
Microsoft Edge (Chromium-based) Tampering Vulnerability
Other sources
Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.
— 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-2026-66313?
CVE-2026-66313 has a medium severity rating of 6.8.
2
How do I fix CVE-2026-66313?
To fix CVE-2026-66313, ensure you update Microsoft Edge (Chromium-based) to the latest version provided by Microsoft.
3
What type of vulnerability is CVE-2026-66313?
CVE-2026-66313 is a tampering vulnerability affecting Microsoft Edge (Chromium-based).
4
What can attackers do with CVE-2026-66313?
An unauthorized attacker can perform tampering locally due to origin validation errors in Microsoft Edge.
5
When was CVE-2026-66313 published?
CVE-2026-66313 was published on July 31, 2026.