Local Privilege Escalation in Anthropic Claude Windows Installer
CVE-2026-22561

4.7MEDIUM

Key Information:

Vendor

Anthropic

Status
Claude Desktop - Windows
Vendor
CVE Published:
31 March 2026

What is CVE-2026-22561?

The Anthropic Claude Windows installer, specifically versions prior to 1.1.3363, is vulnerable to a local privilege escalation attack. This vulnerability arises from uncontrolled search path elements used by the installer, allowing for DLL search-order hijacking. When the installer elevates its privileges through User Account Control (UAC), it searches for dynamic link libraries (DLLs) in its own directory. If a malicious DLL is placed alongside the installer, it can be executed, leading to potential arbitrary code execution and further compromise of the system.

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Affected Version(s)

Claude Desktop - Windows 0 < 1.1.3363

References

https://trust.anthropic.com/resources?s=1cvig6ldp3zvuj1yf...

CVSS V4

Score:
4.7
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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