What’s Vulnerable › Vulnerabilities
CVE-2026-18636: Velociraptor VFSGetBuffer API path deny list bypass
- Severity: medium (CVSS 6.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-11 · updated 2026-10-23
- Weakness: CWE-288
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
- Rapid7 Velociraptor: before 0.77.2 — fixed in 0.77.2
How to fix
Upgrade to a fixed version: Rapid7 Velociraptor 0.77.2. Check the vendor advisory for mitigations.
References
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