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 some loss of confidentiality (C:L), and integrity (I:L) but lead to no loss of availability (A:N). What is the impact of this vulnerability?
An attacker who successfully exploited the vulnerability could view some sensitive information (Confidentiality), make changes to disclosed information (Integrity), but cannot limit access to the resource (Availability).
According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?
The user must visit the attacker‑controlled webpage, and perform the two tap gestures that cause autofill to activate.
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 5.4
Microsoft Edge (Chromium-based) Tampering Vulnerability
Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering over a network.
Revision history
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#1
Information published.
References
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CVE-2026-66317 Microsoft Edge (Chromium-based) Tampering Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66317
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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