{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-18639",
        "assignerOrgId": "9974b330-7714-4307-a722-5648477acda7",
        "state": "PUBLISHED",
        "assignerShortName": "rapid7",
        "dateReserved": "2026-08-03T10:45:09.071Z",
        "datePublished": "2026-08-11T15:05:42.703Z",
        "dateUpdated": "2026-08-11T17:14:12.967Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "9974b330-7714-4307-a722-5648477acda7",
                "shortName": "rapid7",
                "dateUpdated": "2026-08-11T15:05:42.703Z"
            },
            "title": "Velociraptor OIDC Authenticator susceptible to email spoofing",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-290",
                            "description": "CWE-290 Authentication bypass by spoofing",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-22",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-22 Exploiting Trust in Client"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "Rapid7",
                    "product": "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.\n\nThis 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": "<p>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.</p><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/"
                }
            ],
            "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&nbsp;<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"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-08-11T17:13:54.338948Z",
                                "id": "CVE-2026-18639",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-08-11T17:14:12.967Z"
                }
            }
        ]
    }
}