What is CVE-2026-58278?

CVE-2026-58278 is a medium-severity vulnerability in Microsoft Edge (Chromium-based), classified under Server-Side Request Forgery (SSRF). CVSS score: 5.4/10. Published 2026-07-03.

How severe is CVE-2026-58278?

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

SSRF in Microsoft Edge (Chromium-based)

CVE-2026-58278

Server-side request forgery (ssrf) in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.

Vulnerability class: SSRF (Server-Side Request Forgery)

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:N/I:L/A:L.

Affected products

Microsoft Edge (Chromium-based) — versions 1.0.0.0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

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

Frequently asked questions

What is CVE-2026-58278?: CVE-2026-58278 is a medium-severity vulnerability in Microsoft Edge (Chromium-based), classified under Server-Side Request Forgery (SSRF). CVSS score: 5.4/10. Published 2026-07-03.
How severe is CVE-2026-58278?: Medium severity. CVSS v3 base score is 5.4 out of 10.