# CVE-2026-58643 — Microsoft Windows Admin Center

> As of 2026-07-16, CVE-2026-58643 is a MEDIUM-severity vulnerability in Microsoft Windows Admin Center, CVSS v3.1 6.1, EPSS 0.2% (15.0th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-58643, most recently “Microsoft July 2026 Patch Tuesday: 570 Vulnerabilities Fixed, Including 2 Actively Exploited Zero-Days (CVE-2026-56164, CVE-2026-56155)”.

**Last updated:** 2026-07-16

## What is 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.

The record classifies CVE-2026-58643 under weakness class [CWE-79](https://cwe.mitre.org/data/definitions/79.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 58 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 6.1 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 15.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-16

## Is CVE-2026-58643 being exploited?

It currently carries a trending score of 33 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **Microsoft**: Windows Admin Center

## How to fix CVE-2026-58643

No vendor patch reference has been recorded for CVE-2026-58643 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-58643

1 tracked threat in the Threadlinqs corpus references CVE-2026-58643, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Microsoft July 2026 Patch Tuesday: 570 Vulnerabilities Fixed, Including 2 Actively Exploited Zero-Days (CVE-2026-56164, CVE-2026-56155)](https://intel.threadlinqs.com/threat/TL-2026-1325) — CRITICAL · 2026-07-14

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-07-18. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [msrc.microsoft.com — vendor advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58643)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-58643
Full detection coverage and IOCs for threats exploiting CVE-2026-58643 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp