What is CVE-2026-58643?

CVE-2026-58643 is a medium-severity vulnerability in Microsoft Windows Admin Center, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-07-16.

How severe is CVE-2026-58643?

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

XSS in Microsoft Windows Admin Center

CVE-2026-58643

Improper neutralization of input during web page generation ('cross-site scripting') in Windows Admin Center allows an unauthorized attacker to perform spoofing over a network.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-07-16 · last modified 2026-08-14.

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.

EPSS exploit prediction

EPSS: 0.004 (34.5th percentile), scored 2026-10-22.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Microsoft Windows Admin Center — versions 1809.0
Microsoft Windows Admin Center

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Windows Admin Center Spoofing Vulnerability (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-58643?: CVE-2026-58643 is a medium-severity vulnerability in Microsoft Windows Admin Center, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-07-16.
How severe is CVE-2026-58643?: Medium severity. CVSS v3 base score is 6.1 out of 10.