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CVE-2026-22561

Published: Mar 31, 2026Updated: May 10, 2026 Sources: CVE List NVDCWE-427
NVD MITRE
7.8CVSSHIGH
EPSS Score
0.2%
Top 92.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Uncontrolled search path elements in Anthropic Claude for Windows installer (Claude Setup.exe) versions prior to 1.1.3363 allow local privilege escalation via DLL search-order hijacking. The installer loads DLLs (e.g., profapi.dll) from its own directory after UAC elevation, enabling arbitrary code execution if a malicious DLL is planted alongside the installer.

CVSS Vector Breakdown

AV:LAC:LPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-427

Affected Products

Claude Desktop - WindowsAnthropic
SaaS
AI / ML / llm-serving-inference
claudeanthropic
SaaS
AI / ML / llm-serving-inference
anthropiccommercialUSAI / MLaka claude

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Persistence
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References

https://trust.anthropic.com/resources?s=1cvig6ldp3zvuj1yffzr11&name=cve-2026-22561-dll-search-order-hijacking-in-claude-for-windows-installer
trust.anthropic.com

Timeline

Published
Mar 31, 2026
Last Updated
May 10, 2026

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