# CVE-2026-56171 — Microsoft Remote Desktop Web Client

> As of 2026-10-08, CVE-2026-56171 is a HIGH-severity vulnerability in Microsoft Remote Desktop Web Client, CVSS v3.1 7.1, EPSS 0.6% (50.0th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-56171, most recently “Microsoft July 2026 Patch Tuesday: 570 Vulnerabilities Fixed, Including 2 Actively Exploited Zero-Days (CVE-2026-56164, CVE-2026-56155)”.

**Last updated:** 2026-10-08

## What is CVE-2026-56171?

Exposure of private personal information to an unauthorized actor in Windows RDP allows an unauthorized attacker to disclose information over a network.

The record classifies CVE-2026-56171 under weakness class [CWE-359](https://intel.threadlinqs.com/cwe/CWE-359). 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, and has high impact on confidentiality. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 103 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.1 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C`)
- **EPSS (FIRST):** 0.6% probability of exploitation in the next 30 days, higher than 50.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-17, last modified 2026-10-08

## Is CVE-2026-56171 being exploited?

It currently carries a trending score of 26 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Microsoft](https://intel.threadlinqs.com/vendors/microsoft): Remote Desktop Web Client, Windows Admin Center

## How to fix CVE-2026-56171

No vendor patch reference has been recorded for CVE-2026-56171 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-2026-56171

1 tracked threat in the Threadlinqs corpus references CVE-2026-56171, 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, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-10-10.

**Vendor advisory and patch**

- [msrc.microsoft.com — vendor advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56171)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-56171
Full detection coverage and IOCs for threats exploiting CVE-2026-56171 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp