CVE-2026-18639 — HIGH (7.3)

Vulnerability Description

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. This allows a user to impersonate another user by setting their email address within the IdP, allowing account takeover.

CVSS Score

7.3

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

NONE

Related Weaknesses (CWE)

CWE-290

References

http://docs.velociraptor.app/announcements/advisories/cve-2026-18639/

FAQ

What is CVE-2026-18639?

CVE-2026-18639 is a vulnerability with a CVSS score of 7.3 (HIGH). 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...

How severe is CVE-2026-18639?

CVE-2026-18639 has been rated HIGH with a CVSS base score of 7.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-18639?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.