Vulnerability-Lookup

GHSA-3C2P-6J48-GMM4

Vulnerability from github – Published: 2026-03-31 18:31 – Updated: 2026-04-06 18:33

Details

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.

Severity ?

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

4.7 (Medium)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-22561"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-427"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-31T16:16:28Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-3c2p-6j48-gmm4",
  "modified": "2026-04-06T18:33:01Z",
  "published": "2026-03-31T18:31:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-22561"
    },
    {
      "type": "WEB",
      "url": "https://trust.anthropic.com/resources?s=1cvig6ldp3zvuj1yffzr11\u0026name=cve-2026-22561-dll-search-order-hijacking-in-claude-for-windows-installer"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-22561 (GCVE-0-2026-22561)

Vulnerability from cvelistv5 – Published: 2026-03-31 15:30 – Updated: 2026-03-31 18:13

Summary

Severity ?

4.7 (Medium)


                        
                          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

Assigner

hackerone

References

URL

Tags

https://trust.anthropic.com/resources?s=1cvig6ldp…

Impacted products

	Vendor	Product	Version
	Anthropic	Claude Desktop - Windows	Affected: 0 , < 1.1.3363 (semver)

Credits

Kazuma Matsumoto, a security reseaercher at GMO Cybersecurity by IERAE, Inc

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-22561",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-31T16:27:37.909291Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-31T16:33:12.314Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Claude Desktop - Windows",
          "vendor": "Anthropic",
          "versions": [
            {
              "lessThan": "1.1.3363",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Kazuma Matsumoto, a security reseaercher at GMO Cybersecurity by IERAE, Inc"
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 4.7,
            "baseSeverity": "MEDIUM",
            "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",
            "version": "4.0"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-31T18:13:52.328Z",
        "orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
        "shortName": "hackerone"
      },
      "references": [
        {
          "url": "https://trust.anthropic.com/resources?s=1cvig6ldp3zvuj1yffzr11\u0026name=cve-2026-22561-dll-search-order-hijacking-in-claude-for-windows-installer"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
    "assignerShortName": "hackerone",
    "cveId": "CVE-2026-22561",
    "datePublished": "2026-03-31T15:30:38.876Z",
    "dateReserved": "2026-01-07T15:39:03.440Z",
    "dateUpdated": "2026-03-31T18:13:52.328Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-3C2P-6J48-GMM4

CVE-2026-22561 (GCVE-0-2026-22561)

Tags

Sightings

Nomenclature