🛡️ CVE-2026-22561 — claude

🟠 CVSS 7.8 — High ✅ No Known Exploit CWE-427 NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-22561 is classified as CWE-427: Uncontrolled Search Path Element. A writable directory appears in a search path, so a planted file can be loaded in place of the intended one.

Affected software

CVE-2026-22561 is recorded against 1 package.

  • claude (fixed in 1.1.3363)

Timeline and source

Published on 31 March 2026 and last revised on 24 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

trust.anthropic.com

Details

Severity HIGH
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE CWE-427
Public Exploit ✅ No
Source NVD
Published 2026-03-31
Updated 2026-08-11
Modified 2026-07-24
Fix URL N/A

Affected Packages

Software From version Fixed in
claude — 1.1.3363

Site Security Check

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