VulnerabilityAwaiting Analysis

CVE-2026-18639

However, some IdP allow users to change the email claim without verification.

HIGH 7.3EPSS 0.26%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.26%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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 3.1: 7.3 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
EPSS: 0.26% probability · 18th percentile
CISA KEV: Not listed
Weakness: CWE-290
Source: cve@rapid7.com

References

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.