Microsoft Edge (Chromium-based) Spoofing Vulnerability

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, a successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability?
The vulnerability is in the web server, but the malicious scripts execute in the victim’s browser on their machine.

According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?
This vulnerability requires that a user have multiple browser instances open of the affected version of Microsoft Edge (Chromium-based), one of which is a specially crafted website hosted by the attacker. The user would need to access the URL of the malicious website and then click a popup displayed on that site.

What is the version information for this release?
151.0.4129.107: 151.0.4129.107, 08/24/2026: 08/24/2026, 151.0.7922.174: 151.0.7922.174

Security updates
151.0.4129.107 — https://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security