Is CVE-2026-22561 actively exploited?

CVE-2026-22561 has no public evidence of in-the-wild exploitation as of 2026-04-06.

What is the CVSS score for CVE-2026-22561?

CVE-2026-22561 has a CVSS score of 4.7 (MEDIUM severity). 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

How do I patch CVE-2026-22561?

Patch guidance is available from anthropic security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-22561.

CVE-2026-22561 - remediation guidance & executive summary

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 Metrics

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector: local
Complexity: low
Privileges: low
User Action: passive
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-427

Metadata

Primary Vendor: ANTHROPIC
Published: 3/31/2026
Last Modified: 4/6/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

anthropic : claude

Remediation Guidance

Executive Summary

Cite this page

CVE-2026-22561. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-22561

View on NIST NVD

CVE-2026-22561 vulnerability