High severity · published Aug 11, 2026
CVE-2026-18639
Velociraptor OIDC Authenticator susceptible to email spoofing
7.3
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 33% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VE
Velociraptor · Rapid7
before 0.77.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18639
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18639
docs.velociraptor.app
http://docs.velociraptor.app/announcements/advisories/cve-2026-18639/
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