Code execution via client use-after-free
Published Jun 9, 2026 · Updated Jun 9, 2026
Use-after-free in Microsoft Remote Desktop Client on affected Windows builds allows remote attackers to execute code through a malicious RDP server. The client accesses memory after its backing object has been freed while processing network data; Microsoft has not disclosed the responsible function or object lifetime error. Exploitation requires user interaction and a high-complexity condition, after which code runs in the client's security context.
Summary
What happened
Use-after-free in Microsoft Remote Desktop Client on affected Windows builds allows remote attackers to execute code through a malicious RDP server. The client accesses memory after its backing object has been freed while processing network data; Microsoft has not disclosed the responsible function or object lifetime error. Exploitation requires user interaction and a high-complexity condition, after which code runs in the client's security context.
The record
- CVE
- CVE-2026-48563
- Published
- Jun 9, 2026
- Updated
- Jun 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-416, CWE-787, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 9, 2026CVE publishedPublication date reported by the CVE source.
- Jun 9, 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.
- Affected versionversion=10.0.17763.0 <10.0.17763.8880
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
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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