What is CVE-2026-77490?

CVE-2026-77490 is a medium-severity vulnerability in Microsoft Edge (Chromium-Based), classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-09-11.

How severe is CVE-2026-77490?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Microsoft Edge (Chromium-Based)

CVE-2026-77490

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.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Microsoft Edge (Chromium-based)

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-77490?: CVE-2026-77490 is a medium-severity vulnerability in Microsoft Edge (Chromium-Based), classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-09-11.
How severe is CVE-2026-77490?: Medium severity. CVSS v3 base score is 6.1 out of 10.