Summary
Impact: Tampering. Microsoft rating: Important. Not known to be exploited — Exploitation Unlikely. Customer action: Required.
Details
According to the CVSS metrics, successful exploitation of this vulnerability could lead to major loss of confidentiality (C:H), but lead to no loss of integrity (I:N) or availability (A:N). What does that mean for this vulnerability?
An attacker who successfully exploits this vulnerability cannot modify any sensitive user data or cause user data to become unavailable but can access sensitive user data.
What is the version information for this release?
151.0.4129.59: 151.0.4129.59, 07/31/2026: 07/31/2026, 151.0.7922.71/.72: 151.0.7922.71/.72
Security updates
151.0.4129.59 — https://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security
Vulnerabilities 1
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Medium 6.2
Microsoft Edge (Chromium-based) Tampering Vulnerability
Missing authorization in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.
Revision history
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#1
Information published.
References
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CVE-2026-66311 Microsoft Edge (Chromium-based) Tampering Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66311
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss