What is CVE-2026-66310?

CVE-2026-66310 is a high-severity vulnerability in Microsoft Edge, classified under External Control of File Name or Path. CVSS score: 7.7/10. Published 2026-08-04.

How severe is CVE-2026-66310?

High severity. CVSS v3 base score is 7.7 out of 10.

Vulnerability in Microsoft Edge

CVE-2026-66310

External control of file name or path in Microsoft Edge for Android allows an unauthorized attacker to disclose information locally.

EPSS: 0.002 (13.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Microsoft Edge
Microsoft Edge For Android — versions 1.0.0

Weakness classification (CWE)

CWE-73 — External Control of File Name or Path

References

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

Frequently asked questions

What is CVE-2026-66310?: CVE-2026-66310 is a high-severity vulnerability in Microsoft Edge, classified under External Control of File Name or Path. CVSS score: 7.7/10. Published 2026-08-04.
How severe is CVE-2026-66310?: High severity. CVSS v3 base score is 7.7 out of 10.