{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.1",
    "cveMetadata": {
        "cveId": "CVE-2026-18639",
        "assignerOrgId": "00000000-0000-4000-9000-000000000000",
        "requesterUserId": "00000000-0000-4000-9000-000000000000",
        "serial": 1,
        "state": "PUBLISHED"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "00000000-0000-4000-9000-000000000000"
            },
            "title": "Velociraptor OIDC Authenticator susceptible to email spoofing",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-290",
                            "description": "CWE-290: Authentication Bypass by Spoofing",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "Rapid7",
                    "product": "Velociraptor",
                    "platforms": [
                        "Linux"
                    ],
                    "packageName": "Velociraptor",
                    "repo": "https://github.com/Velocidex/velociraptor/",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThan": "0.77.2",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "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.<div>This allows a user to impersonate another user by setting their email address within the IdP, allowing account takeover.</div>"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "http://docs.velociraptor.app/announcements/advisories/cve-2026-18639/"
                },
                {
                    "url": "https://github.com/Velocidex/velociraptor/commit/0d8e563dfb2a2e4f060fdc3b7fc822bcdc19a3d9"
                }
            ],
            "metrics": [
                {
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ],
                    "cvssV3_1": {
                        "version": "3.1",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "LOW",
                        "userInteraction": "REQUIRED",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "HIGH",
                        "availabilityImpact": "NONE",
                        "baseSeverity": "HIGH",
                        "baseScore": 7.3,
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N"
                    }
                }
            ],
            "configurations": [
                {
                    "lang": "en",
                    "value": "Velociraptor must be configured to use an IdP which does not verify a user's email and allows the user to set their email. Examples include Azure IdP and Keycloak in self enrollment mode.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "Velociraptor must be configured to use an IdP which does not verify a user's email and allows the user to set their email. Examples include Azure IdP and Keycloak in self enrollment mode."
                        }
                    ]
                }
            ],
            "workarounds": [
                {
                    "lang": "en",
                    "value": "You can change the claim that Velociraptor uses as the username using the  Configuration File https://docs.velociraptor.app/docs/deployment/references/#GUI.authenticator.claims.username  . Set the username using a more permanent claim for example with Azure the \"upn\" or \"oid\" can not be chosen by the user.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "You can change the claim that Velociraptor uses as the username using the <a href=\"https://docs.velociraptor.app/docs/deployment/references/#GUI.authenticator.claims.username\">Configuration File</a>&nbsp;. Set the username using a more permanent claim for example with Azure the \"upn\" or \"oid\" can not be chosen by the user."
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Leonardo Souza (anauaque)",
                    "type": "finder"
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "x_generator": {
                "engine": "Vulnogram 1.0.4"
            }
        }
    }
}