{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.77.2"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "c0c9dd609140139efcb37c47e2afa79ed57e6c84"
            }
          ],
          "repo": "https://github.com/velocidex/velociraptor",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "rapid7",
    "cwe_ids": [
      "CWE-290"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18639.json"
  },
  "details": "When Velociraptor is configured to use an OIDC IdP for authentication, it uses the email claim as a username. However, some IdP allow users to change the email claim without verification. Some IdPs do not set the \"email_verified\" claim and do not actually verify the email.\n\nThis allows a user to impersonate another user by setting their email address within the IdP, allowing account takeover.",
  "id": "CVE-2026-18639",
  "modified": "2026-08-13T03:51:50.182690167Z",
  "published": "2026-08-11T15:05:42.703Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Velocidex/velociraptor/"
    },
    {
      "type": "ADVISORY",
      "url": "http://docs.velociraptor.app/announcements/advisories/cve-2026-18639/"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18639.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18639"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Velociraptor OIDC Authenticator susceptible to email spoofing"
}