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.
History

Tue, 07 Apr 2026 08:00:00 +0000

Type Values Removed Values Added
Title DLL Search-Order Hijacking in Anthropic Claude Windows Installer Enables Local Privilege Escalation
Weaknesses CWE-779

Mon, 06 Apr 2026 18:00:00 +0000

Type Values Removed Values Added
First Time appeared Anthropic claude
Microsoft
Microsoft windows
Weaknesses CWE-427
CPEs cpe:2.3:a:anthropic:claude:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*
Vendors & Products Anthropic claude
Microsoft
Microsoft windows
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}


Wed, 01 Apr 2026 02:15:00 +0000

Type Values Removed Values Added
Title DLL Search-Order Hijacking in Anthropic Claude Windows Installer Enables Local Privilege Escalation
First Time appeared Anthropic
Anthropic claude Desktop
Weaknesses CWE-779
Vendors & Products Anthropic
Anthropic claude Desktop

Tue, 31 Mar 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 31 Mar 2026 16:00:00 +0000

Type Values Removed Values Added
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.
References
Metrics cvssV4_0

{'score': 4.7, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: hackerone

Published: 2026-03-31T15:30:38.876Z

Updated: 2026-03-31T18:13:52.328Z

Reserved: 2026-01-07T15:39:03.440Z

Link: CVE-2026-22561

cve-icon Vulnrichment

Updated: 2026-03-31T16:31:29.129Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-31T16:16:28.850

Modified: 2026-04-06T16:58:22.433

Link: CVE-2026-22561

cve-icon Redhat

No data.