Medium severity · published Aug 11, 2026
CVE-2026-18636
Velociraptor VFSGetBuffer API path deny list bypass
6.8
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 34% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VE
Velociraptor · Rapid7
before 0.77.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18636
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18636
docs.velociraptor.app
http://docs.velociraptor.app/announcements/advisories/cve-2026-18636/
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