Vulnerability · Published Aug 11, 2026 · Assigned by rapid7
CVE-2026-18636Velociraptor VFSGetBuffer API path deny list bypass
Medium 6.8
In plain English
A medium-severity authentication bypass in Velociraptor from Rapid7. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Rapid7 | Velociraptor | 0 – before 0.77.2 |
Weakness: CWE-288 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N