Cross-site scripting in Microsoft Edge - CVE-2026-77490
Published: September 14, 2026
Vulnerability identifier: #VU149477
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-77490
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform spoofing.
The vulnerability exists due to improper neutralization of input during web page generation in Microsoft Edge (Chromium-based) when rendering web pages. A remote attacker can host a specially crafted website to perform spoofing.
User interaction is required: a user must access the malicious website and click a popup while multiple affected browser instances are open.
Affected software
Microsoft Edge
How to mitigate CVE-2026-77490
Install security update from vendor's website.
Microsoft Edge - update to 151.0.4129.107