Microsoft Edge (Chromium-based) Spoofing Vulnerability

According to the CVSS metric, successful exploitation of this vulnerability could lead to some loss of integrity (I:L)? What does that mean for this vulnerability?
An attacker who successfully exploited this vulnerability could cover and spoof elements of the UI. The modified information is only visual.

How could an attacker exploit this vulnerability?
To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control of an affected system.
Additionally, an attacker could convince a local user to open a malicious file. The attacker would have to convince the user to click a link, typically by way of an enticement in an email or instant message, and then convince them to open the specially crafted file.

Why is the severity for this CVE rated as Moderate, but the CVSS score is higher than normal?
Per our severity guidelines, the amount of user interaction or preconditions required to allow this sort of exploitation downgraded the severity, specifically it says, "If a bug requires more than a click, a key press, or several preconditions, the severity will be downgraded". The CVSS scoring system doesn't allow for this type of nuance.

Security updates
123.0.2420.81 — https://docs.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security