CVE-2026-18639 Velociraptor OIDC Authenticator susceptible to email spoofing

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 "emailverified" claim and do not actually verify the email. This allows a user to...

CVE-2026-18639

CVE-2026-18639 affects Velociraptor's OIDC authenticator. The vulnerability arises when Velociraptor uses the email claim as a username; some IdPs allow changing the email without verification, and some do not set or verify the email_verified claim. This can enable a user to impersonate another b...