CVE-2026-18636

Velociraptor VFSGetBuffer API path deny list bypass

Published Aug 11, 2026 CVSS 3.1 · 6.8 Medium EPSS < 1% KEV · Not listed
Description
The 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.

Remediation

Vendor Workaround

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.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Rapid7
Rapid7 velociraptor
Vendors & Products Rapid7
Rapid7 velociraptor
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description The 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.
Title Velociraptor VFSGetBuffer API path deny list bypass
Weaknesses CWE-288
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
rapid7
Published
Updated
Aug 11, 2026, 7:43 PM
Reserved
Aug 3, 2026, 10:21 AM
Status
Awaiting Analysis
Published
Aug 11, 2026, 3:17 PM
Modified
Oct 23, 2026, 7:10 PM