What is CVE-2026-57977?

CVE-2026-57977 is a high-severity vulnerability in Microsoft Edge (Chromium-based), classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2026-07-03.

How severe is CVE-2026-57977?

High severity. CVSS v3 base score is 7.1 out of 10.

XSS in Microsoft Edge (Chromium-based)

CVE-2026-57977

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 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N.

Affected products

Microsoft Edge (Chromium-based) — versions 1.0.0.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

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

Frequently asked questions

What is CVE-2026-57977?: CVE-2026-57977 is a high-severity vulnerability in Microsoft Edge (Chromium-based), classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2026-07-03.
How severe is CVE-2026-57977?: High severity. CVSS v3 base score is 7.1 out of 10.