{"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\u00a0 Configuration File https://docs.velociraptor.app/docs/deployment/references/#GUI.authenticator.claims.username \u00a0. 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"}}]}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Velociraptor", "repo": "https://github.com/Velocidex/velociraptor/", "vendor": "Rapid7", "versions": [{"lessThan": "0.77.2", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "cve@rapid7.com"}], "cveTags": [], "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."}], "id": "CVE-2026-18639", "lastModified": "2026-08-11T16:17:30.590", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 5.2, "source": "cve@rapid7.com", "type": "Secondary"}]}, "published": "2026-08-11T16:17:30.590", "references": [{"source": "cve@rapid7.com", "url": "http://docs.velociraptor.app/announcements/advisories/cve-2026-18639/"}], "sourceIdentifier": "cve@rapid7.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-290"}], "source": "cve@rapid7.com", "type": "Secondary"}]}

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