Vulnerability · Published Aug 11, 2026 · Assigned by rapid7

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

High 7.3

In plain English

A high-severity authentication bypass by spoofing in Velociraptor from Rapid7. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).

Severity (CVSS 3.1)7.3High

Exploit odds (30 days)0.4%top 67.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Rapid7	Velociraptor	0 – before 0.77.2

Weakness: CWE-290 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

References

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