Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?
In a web-based attack scenario, an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) that contains a specially crafted file that is designed to exploit the vulnerability. However, an attacker would have no way to force the user to visit the website. Instead, an attacker would have to convince the user to click a link, typically by way of an enticement in an email or Instant Messenger message, and then convince the user to open the specially crafted file.
How could an attacker exploit this vulnerability?
An unauthenticated attacker could host a specially crafted webpage and convince a user to visit it using an affected version of Microsoft Edge. Successful exploitation could allow the attacker to execute code within the browser renderer process. User interaction is required.
Security updates
154.0.4258.48 — https://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security
154.0.4258.48 — https://learn.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security
Vulnerabilities 1
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High 8.8
Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
Access of resource using incompatible type ('type confusion') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
Revision history
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#2
Added Edge software to the Security Updates table. Customers that are running supported version of Edge are encouraged to update to the indicated version to be protected from this vulnerability.
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#1
Information published.
References
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CVE-2026-85898 Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85898
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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