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CVE-2026-18636— Velociraptor VFSGetBuffer API path deny list bypass

Quick assessment

Affected
Rapid7 Velociraptor
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Rapid7 velociraptor是美国Rapid7公司开源的一款终端安全与响应工具。 Rapid7 velociraptor 0.77.2之前版本存在授权问题漏洞，该漏洞源于gRPC API的VFSGetBuffer端点路径前缀检查可被绕过，可能导致用户读取通常被拒绝的敏感文件，若具有ROOT组织读取权限，还可访问其他组织的数据。

CVSS 6.8 · Medium EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
Rapid7 Velociraptor < 0.77.2 affected
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I. Basic Information for CVE-2026-18636

Vulnerability Information
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Vulnerability Title
Velociraptor VFSGetBuffer API path deny list bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选路径或通道进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Rapid7 velociraptor 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rapid7 velociraptor是美国Rapid7公司开源的一款终端安全与响应工具。 Rapid7 velociraptor 0.77.2之前版本存在授权问题漏洞，该漏洞源于gRPC API的VFSGetBuffer端点路径前缀检查可被绕过，可能导致用户读取通常被拒绝的敏感文件，若具有ROOT组织读取权限，还可访问其他组织的数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Rapid7 Velociraptor 0 ~ 0.77.2 -

II. Public POCs for CVE-2026-18636

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III. Intelligence Information for CVE-2026-18636

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Vendor Advisories for CVE-2026-18636 (1)

Same Patch Batch · Rapid7 · 2026-08-11 · 9 CVEs total

CVE-2026-18972 9.6 CRITICAL Velociraptor authenticated identity-spoofing vulnerability
CVE-2026-18860 8.7 HIGH Velociraptor incorrect Org deletion permissions check
CVE-2026-18639 7.3 HIGH Velociraptor OIDC Authenticator susceptible to email spoofing
CVE-2026-18635 7.2 HIGH Velociraptor query plugin allows impersonation in other orgs
CVE-2026-18640 7.1 HIGH Velociraptor directory traversal via the NewNotebook API
CVE-2026-18638 6.5 MEDIUM Velociraptor server crash via the SetPassword API
CVE-2026-17535 6.2 MEDIUM Velociraptor Multiple Crashes in NTFS Parser when applied to invalid NTFS Volumes
CVE-2026-18348 4.1 MEDIUM Velociraptor NETWORK ACL bypass via upload_azure / upload_sftp / upload_smb VQL plugins

IV. Related Vulnerabilities

Same product: Velociraptor
Same vendor: Rapid7
Same weakness: CWE-288

V. Comments for CVE-2026-18636

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