How severe is CVE-2026-56171?

CVE-2026-56171 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2026-56171 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-56171?

CVE-2026-56171 primarily affects Microsoft Remote Desktop Web Client. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-56171?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-56171 published?

CVE-2026-56171 was published on 2026-07-17 and last updated on 2026-07-22.

CVE-2026-56171

CVE-2026-56171 is a high-severity vulnerability in Microsoft Remote Desktop Web Client with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-359.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (40th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-359
Affected product: Microsoft Remote Desktop Web Client
Published: 2026-07-17
Last modified: 2026-07-22

Description

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

Frequently asked questions

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.
How severe is CVE-2026-56171?: CVE-2026-56171 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2026-56171 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-56171?: CVE-2026-56171 primarily affects Microsoft Remote Desktop Web Client. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-56171?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-56171 published?: CVE-2026-56171 was published on 2026-07-17 and last updated on 2026-07-22.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56171

Affected products (2)

cpe:2.3:a:microsoft:remote_desktop_web_client:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:windows_admin_center:*:*:*:*:*:*:*:*

Other CWE-359 vulnerabilities

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