{"id":"CVE-2026-18636","state":"PUBLISHED","title":"Velociraptor VFSGetBuffer API path deny list bypass","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.","publishedAt":"2026-08-11T14:40:12.322Z","updatedAt":"2026-08-11T19:43:56.379Z","severity":{"score":6.8,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N","source":"rapid7"},"assigner":"rapid7","products":["Rapid7 Velociraptor"],"affected":[{"vendor":"Rapid7","product":"Velociraptor","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.77.2","versionType":"semver"}],"repo":"https://github.com/Velocidex/velociraptor/"}],"references":["http://docs.velociraptor.app/announcements/advisories/cve-2026-18636/"],"weaknesses":["CWE-288"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/18xxx/CVE-2026-18636.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-18636","state":"PUBLISHED","datePublished":"2026-08-11T14:40:12.322Z","dateUpdated":"2026-08-11T19:43:56.379Z","assignerShortName":"rapid7","assignerOrgId":"9974b330-7714-4307-a722-5648477acda7","dateReserved":"2026-08-03T10:21:25.241Z"},"containers":{"cna":{"title":"Velociraptor VFSGetBuffer API path deny list bypass","descriptions":[{"lang":"en","value":"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":[{"vendor":"Rapid7","product":"Velociraptor","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.77.2","versionType":"semver"}],"repo":"https://github.com/Velocidex/velociraptor/"}],"references":[{"url":"http://docs.velociraptor.app/announcements/advisories/cve-2026-18636/"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE","baseSeverity":"MEDIUM","baseScore":6.8,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-288","lang":"en","description":"CWE-288 Authentication bypass using an alternate path or channel","type":"CWE"}]}],"providerMetadata":{"shortName":"rapid7","orgId":"9974b330-7714-4307-a722-5648477acda7","dateUpdated":"2026-08-11T14:40:12.322Z"},"impacts":[{"capecId":"CAPEC-115","descriptions":[{"lang":"en","value":"CAPEC-115 Authentication Bypass"}]}],"configurations":[{"lang":"en","value":"To exploit this the user must have the \"reader\" role on the ROOT org.","supportingMedia":[{"type":"text/html","base64":false,"value":"To exploit this the user must have the \"reader\" role on the ROOT org.&nbsp;"}]}],"workarounds":[{"lang":"en","value":"As  documented https://docs.velociraptor.app/docs/deployment/security/#the-root-org ,  the root org is more privileged than other orgs. You should only give trusted users access to the root org.","supportingMedia":[{"type":"text/html","base64":false,"value":"As&nbsp;<a href=\"https://docs.velociraptor.app/docs/deployment/security/#the-root-org\">documented</a>,&nbsp; the root org is more privileged than other orgs.&nbsp;You should only give trusted users access to the root org."}]}],"credits":[{"lang":"en","value":"Itay Vardi","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.4"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-11T19:25:52.804927Z","id":"CVE-2026-18636","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-11T19:43:56.379Z"}}]}}}