Velociraptor VFSGetBuffer API path deny list bypass

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-18636
StatePUBLISHED
Assignerrapid7
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-11 15:17:28 UTC
Updated2026-08-11 15:17:28 UTC
DescriptionThe Velociraptor gRPC API has a VFSGetBuffer endpoint which allows reading files from the datastore. To prevent users from reading sensitive files or accessing other orgs, the requested path is prefix checked against a list of denied prefixes. This prefix check can be bypassed allowing a user to access usually denied files. If the user has read permission in the ROOT org, this allows access to other orgs, in which the user may not have permission.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

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

Problem Types: CWE-288 | CWE-288 CWE-288 Authentication bypass using an alternate path or channel

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
3.1CNACVSS6.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/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-2026-18636 [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: Itay Vardi (en)

Additional Advisory Data

Workarounds

CNA: As  documented https://docs.velociraptor.app/docs/deployment/security/#the-root-org ,  the root org is more privileged than other orgs. You should only give trusted users access to the root org.

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