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Velociraptor OIDC Authenticator susceptible to email spoofing

Type: advisorySources: OSV

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. This allows a user to impersonate another user by setting their email address within the IdP, allowing account takeover.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-18639
Confirmed fixed CVEs
Not specified
Updated in this feed
5 Nov 2026, 00:02 UTC · Revision 1

Source evidence

Velociraptor OIDC Authenticator susceptible to email spoofing

core-osv · Original source

Published 11 Aug 2026, 15:05 UTC

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. This allows a user to impersonate another user by setting their email address within the IdP, allowing account takeover.

osv:CVE-2026-18639
Complete source record
{
  "id": "3cd25b5c45641f059c188a9459277ee9f4bd622a5d4c0558996b7580c80c7264",
  "url": "https://osv.dev/vulnerability/CVE-2026-18639",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Velociraptor OIDC Authenticator susceptible to email spoofing",
    "summary": "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. This allows a user to impersonate another user by setting their email address within the IdP, allowing account takeover.",
    "evidence": "osv:CVE-2026-18639",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-18639",
      "aliases": [
        "CVE-2026-18639"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/velocidex/velociraptor",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "c0c9dd609140139efcb37c47e2afa79ed57e6c84"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.77.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.77.1",
            "v0.77.1-rc1",
            "v0.76.1-rc1",
            "v0.75",
            "v0.74",
            "v0.73",
            "v0.72",
            "v0.7.0",
            "v0.7.0-rc1",
            "v0.6.8-rc1",
            "v0.6.7-rc1",
            "v0.6.4-rc1",
            "v0.6.3-rc1",
            "v0.6.2-rc1",
            "v0.6.1-rc1",
            "v0.6.0-rc1",
            "v0.5.9-rc1",
            "v0.5.8-rc1",
            "v0.5.7",
            "v0.5.6",
            "v0.5.5-1",
            "v0.5.5",
            "v0.5.4",
            "v0.5.3",
            "v0.5.2",
            "v0.5.1",
            "v0.5.0",
            "v0.4.9",
            "v0.4.8",
            "v0.4.7",
            "v0.4.6",
            "v0.4.5",
            "v0.4.4",
            "v0.4.3",
            "v0.4.2",
            "v0.4.1",
            "v0.4.0",
            "v0.3.9",
            "v0.3.8",
            "v0.3.7",
            "v0.3.6",
            "v0.3.5",
            "v0.3.4",
            "v0.3.3",
            "v0.3.2",
            "v0.3.1",
            "v0.3.0",
            "0.2.9",
            "0.2.8",
            "0.2.7",
            "0.2.6",
            "0.2.5",
            "0.2.4",
            "0.2.3",
            "0.2.2",
            "0.2.1",
            "v0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-18639.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.528616823Z",
      "provider": "osv",
      "references": [
        "https://github.com/Velocidex/velociraptor/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18639.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-18639"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-290"
        ],
        "cna_assigner": "rapid7",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18639.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-18639",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 508232,
  "published_at": "2026-08-11T15:05:42.703+00:00"
}