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CVE-2026-54990: Remote Desktop Client Remote Code Execution Vulnerability

criticalCVSS 9.8CVE-2026-54990
Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoftproduct: Remote Desktop ClientRemote code execution
What
A heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
Who is affected
Unauthorized attackers targeting Remote Desktop Client are affected.
Urgency
Remediation is critical due to the high severity and potential for remote code execution.
Action
Apply the latest security patch for Remote Desktop Client.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
critical — CVSS 9.8
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54990

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-54990coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Remote Desktop Client

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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