CVE-2026-56171Network attack vector

Remote private-information disclosure

Published Jul 17, 2026 · Updated Jul 17, 2026

Information disclosure in Remote Desktop Web Client before 2.1.65.2 and Windows Admin Center before 2.7.4 allows remote attackers to read data. Microsoft has not published the affected request handler or the operation that exposes private personal information. Exploitation requires user interaction and permits limited data modification alongside disclosure, without service interruption.

CVSS severity7.1
High
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Remote Desktop Web Client before 2.1.65.2 and Windows Admin Center before 2.7.4 allows remote attackers to read data. Microsoft has not published the affected request handler or the operation that exposes private personal information. Exploitation requires user interaction and permits limited data modification alongside disclosure, without service interruption.

The record

CVE
CVE-2026-56171
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
Microsoft
Product
Windows Admin Center
Classifications
CWE-359
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1809.0 <2.7.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Windows Admin Centerversion=1809.0 <2.7.4
Microsoft · Remote Desktop Web Clientversion=2.0.0.0 <2.1.65.2

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.1Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-359Exposure of Private Personal Information to an Unauthorized Actor

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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