{"id":"CVE-2026-18639","title":"When Velociraptor is configured to use an OIDC IdP for authentication, it uses the email claim as a username","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 a…","severity":"high","cvss":7.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N","cwe":["CWE-290"],"published":"2026-08-11","updated":"2026-08-28","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-18639","references":[{"url":"http://docs.velociraptor.app/announcements/advisories/cve-2026-18639/","label":"cve@rapid7.com"}],"tags":["nvd"],"epss":0.00263,"epssPercentile":0.18397,"ingestedAt":"2026-08-29T19:41:14.642Z","slug":"CVE-2026-18639","body":"## Overview\n\nWhen 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":40.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}