Microsoft has issued an important security update to address a significant vulnerability in its Edge browser, which could permit remote attackers to execute arbitrary code on affected systems. This critical flaw, identified as CVE-2026-45495, was reported by Orange Tsai of the DEVCORE Research Team. The vulnerability has a CVSS v3 score of 7.5, indicating a high level of severity, and exploitation requires user interaction such as visiting a malicious website or opening a crafted file.
Details of the Edge Vulnerability
The core issue within Microsoft Edge arises from inadequate validation during the processing of feedback log files. The browser fails to properly validate user-supplied file paths prior to performing file operations, leading to potential exploitation by attackers. By manipulating a user into interacting with a malicious file or website, an attacker could leverage this flaw to execute code with the same privileges as the logged-in user.
The impact of such an exploit is wide-ranging, with potential consequences including data theft, compromise of browser profiles, and even local persistence or lateral movement in environments where higher privileges are available. The vulnerability’s root cause lies in a path-validation defect within the feedback log handling process, which an attacker can exploit by providing a specially crafted path to influence file operations.
Additional Edge Vulnerabilities
In conjunction with the fix for CVE-2026-45495, Microsoft has also released updates for two other vulnerabilities found by the same research team. These include CVE-2026-45494, a navigation-handling weakness with a CVSS score of 5.0 that allows cross-origin script injection, and CVE-2026-45492, which involves insufficient origin validation in cross-device managed sign-ins, scoring 4.3 on the CVSS scale.
Both vulnerabilities also require user interaction for exploitation. Microsoft has not published any exploit code, but the nature of these vulnerabilities suggests that social engineering tactics, such as malicious attachments or drive-by downloads, could be employed to deliver exploits.
Recommendations and Future Outlook
Microsoft advises all users and administrators to update their Edge browser to the latest stable release immediately to mitigate these vulnerabilities. Updates can be applied via Microsoft Update or the Edge About page. It is also recommended to apply any operating system patches as prompted, scrutinize untrusted attachments and links, utilize least-privilege accounts for daily activities, and monitor endpoint systems for unusual activity.
These vulnerabilities were initially reported to Microsoft on May 20, 2026, with public advisories released on June 4, 2026. Prioritizing the update for CVE-2026-45495 is crucial given its potential for code execution, and ensuring comprehensive patching across user endpoints is vital to reduce exposure to these risks.
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