CVE-2026-56171 Vulnerability Analysis & Exploit Details

CVE-2026-56171
Vulnerability Scoring

7.1
/10
Very High Risk

Highly exploitable, CVE-2026-56171 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: Required
    User interaction is necessary for successful exploitation.

CVE-2026-56171 Details

Status: Analyzed

Last updated: 🕕 22 Jul 2026, 18:24 UTC
Originally published on: 🕙 17 Jul 2026, 22:17 UTC

Time between publication and last update: 4 days

CVSS Release: version 3

CVSS3 Source

secure@microsoft.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

CVE-2026-56171 Vulnerability Summary

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.

Assessing the Risk of CVE-2026-56171

Access Complexity Graph

The exploitability of CVE-2026-56171 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-56171

With low attack complexity and no required privileges, CVE-2026-56171 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-56171, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-56171, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2026-56171 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: Low
    Exploiting CVE-2026-56171 may cause minor changes to data without severely impacting its accuracy.
  • Availability: None
    CVE-2026-56171 does not impact system availability.

CVE-2026-56171 References

External References

CWE Common Weakness Enumeration

CWE-359

CAPEC Common Attack Pattern Enumeration and Classification

  • Evercookie CAPEC-464 An attacker creates a very persistent cookie that stays present even after the user thinks it has been removed. The cookie is stored on the victim's machine in over ten places. When the victim clears the cookie cache via traditional means inside the browser, that operation removes the cookie from certain places but not others. The malicious code then replicates the cookie from all of the places where it was not deleted to all of the possible storage locations once again. So the victim again has the cookie in all of the original storage locations. In other words, failure to delete the cookie in even one location will result in the cookie's resurrection everywhere. The evercookie will also persist across different browsers because certain stores (e.g., Local Shared Objects) are shared between different browsers.
  • Cross Site Identification CAPEC-467 An attacker harvests identifying information about a victim via an active session that the victim's browser has with a social networking site. A victim may have the social networking site open in one tab or perhaps is simply using the "remember me" feature to keep their session with the social networking site active. An attacker induces a payload to execute in the victim's browser that transparently to the victim initiates a request to the social networking site (e.g., via available social network site APIs) to retrieve identifying information about a victim. While some of this information may be public, the attacker is able to harvest this information in context and may use it for further attacks on the user (e.g., spear phishing).
  • Probe iOS Screenshots CAPEC-498 An adversary examines screenshot images created by iOS in an attempt to obtain sensitive information. This attack targets temporary screenshots created by the underlying OS while the application remains open in the background.
  • Shoulder Surfing CAPEC-508 In a shoulder surfing attack, an adversary observes an unaware individual's keystrokes, screen content, or conversations with the goal of obtaining sensitive information. One motive for this attack is to obtain sensitive information about the target for financial, personal, political, or other gains. From an insider threat perspective, an additional motive could be to obtain system/application credentials or cryptographic keys. Shoulder surfing attacks are accomplished by observing the content "over the victim's shoulder", as implied by the name of this attack.

Vulnerable Configurations

  • cpe:2.3:a:microsoft:remote_desktop_web_client:0.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:0.8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:0.8.1:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:0.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:0.9.0:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:0.9.0:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.7:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.7:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.11:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.11:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.18.0:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.18.0:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.20.0:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.20.0:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.21.0:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.21.0:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.22.0:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.22.0:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.24.0:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.24.0:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.25.0:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.25.0:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.26.0:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.26.0:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.27.0:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.27.0:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.28.0:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:1.0.28.0:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:2.1.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:2.1.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:2.1.62.1:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:2.1.62.1:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:remote_desktop_web_client:2.1.65.0:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:remote_desktop_web_client:2.1.65.0:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:-:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:-:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1709:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1709:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1711:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1711:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1712:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1712:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1802:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1802:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1803:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1803:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1804:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1804:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1804.25:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1804.25:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1806:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1806:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1807:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1807:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1808:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1808:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1809:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1809:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1809.5:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1809.5:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1812:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1812:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1902:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1902:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1903:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1903:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1904:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1904:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1906:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1906:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1907:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1907:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1908:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1908:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1909:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1909:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:1910:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:1910:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:2410:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:2410:*:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:windows_admin_center:2511:*:*:*:*:*:*:*
    cpe:2.3:a:microsoft:windows_admin_center:2511:*:*:*:*:*:*:*

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