{"id":"CVE-2026-22561","state":"PUBLISHED","title":"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 hija","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.","publishedAt":"2026-03-31T15:30:38.876Z","updatedAt":"2026-05-10T13:58:31.956Z","severity":{"score":4.7,"label":"Medium","version":"4.0","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","source":"hackerone"},"assigner":"hackerone","products":["Anthropic Claude Desktop - Windows"],"affected":[{"vendor":"Anthropic","product":"Claude Desktop - Windows","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.1.3363","versionType":"semver"}]}],"references":["https://trust.anthropic.com/resources?s=1cvig6ldp3zvuj1yffzr11&name=cve-2026-22561-dll-search-order-hijacking-in-claude-for-windows-installer"],"weaknesses":["CWE-427"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/22xxx/CVE-2026-22561.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-22561","state":"PUBLISHED","datePublished":"2026-03-31T15:30:38.876Z","dateUpdated":"2026-05-10T13:58:31.956Z","assignerShortName":"hackerone","assignerOrgId":"36234546-b8fa-4601-9d6f-f4e334aa8ea1","dateReserved":"2026-01-07T15:39:03.440Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Anthropic","product":"Claude Desktop - Windows","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.1.3363","versionType":"semver"}]}],"references":[{"url":"https://trust.anthropic.com/resources?s=1cvig6ldp3zvuj1yffzr11&name=cve-2026-22561-dll-search-order-hijacking-in-claude-for-windows-installer"}],"metrics":[{"cvssV4_0":{"version":"4.0","vectorString":"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","baseScore":4.7,"baseSeverity":"MEDIUM"}}],"providerMetadata":{"shortName":"hackerone","orgId":"36234546-b8fa-4601-9d6f-f4e334aa8ea1","dateUpdated":"2026-03-31T18:13:52.328Z"},"credits":[{"lang":"en","value":"Kazuma Matsumoto, a security reseaercher at GMO Cybersecurity by IERAE, Inc","type":"finder"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-31T16:27:37.909291Z","id":"CVE-2026-22561","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-427","type":"CWE","lang":"en","description":"CWE-427 Uncontrolled Search Path Element"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-10T13:58:31.956Z"}}]}}}