What is CVE-2026-58524?

CVE-2026-58524 is a medium-severity vulnerability in Microsoft Edge Chromium, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-07-03.

How severe is CVE-2026-58524?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Microsoft Edge Chromium

CVE-2026-58524

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)

EPSS: 0.002 (15.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

Affected products

Microsoft Edge_chromium
Microsoft Edge (Chromium-based) — versions 1.0.0.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Microsoft Edge (Chromium-based) Spoofing Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-58524?: CVE-2026-58524 is a medium-severity vulnerability in Microsoft Edge Chromium, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-07-03.
How severe is CVE-2026-58524?: Medium severity. CVSS v3 base score is 5.4 out of 10.