---
id: CVE-2026-18636
title: >-
  The Velociraptor gRPC API has a VFSGetBuffer endpoint which allows reading
  files from the datastore
summary: >-
  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 pre…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N'
cwe:
  - CWE-288
published: '2026-08-11'
updated: '2026-08-28'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18636'
references:
  - url: 'http://docs.velociraptor.app/announcements/advisories/cve-2026-18636/'
    label: cve@rapid7.com
tags:
  - nvd
epss: 0.004
epssPercentile: 0.3148
ingestedAt: '2026-08-29T19:41:14.155Z'
---

## Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.