{"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"}}]}}