CVE-2026-77490: Microsoft Edge (Chromium-based) Spoofing Vulnerability

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-11 · updated 2026-10-31
Weakness: CWE-79

Description

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.

Affected products

Microsoft Edge (Chromium): before 151.0.4129.107 — fixed in 151.0.4129.107
Microsoft Edge (Chromium): from 1.0.0.0 before 151.0.4129.107 — fixed in 151.0.4129.107

How to fix

Upgrade to a fixed version: Microsoft Edge (Chromium) 151.0.4129.107; Microsoft Edge (Chromium) 151.0.4129.107. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77490

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