Velociraptor OIDC Authenticator susceptible to email spoofing

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-18639
StatePUBLISHED
Assignerrapid7
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-11 16:17:30 UTC
Updated2026-08-11 18:17:21 UTC
DescriptionWhen 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.

Risk And Classification

Primary CVSS: v3.1 7.3 HIGH from [email protected]

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

EPSS: 0.002630000 probability, percentile 0.180240000 (date 2026-08-12)

Problem Types: CWE-290 | CWE-290 CWE-290 Authentication bypass by spoofing

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.3HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
3.1CNACVSS7.3HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Rapid7 Velociraptor affected 0.77.2 semver Not specified

References

ReferenceSourceLinkTags
docs.velociraptor.app/announcements/advisories/cve-2026-18639 [email protected] docs.velociraptor.app
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Leonardo Souza (anauaque) (en)

Additional Advisory Data

Workarounds

CNA: You can change the claim that Velociraptor uses as the username using the  Configuration File https://docs.velociraptor.app/docs/deployment/references/#GUI.authenticator.claims.username  . Set the username using a more permanent claim for example with Azure the "upn" or "oid" can not be chosen by the user.

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