Path traversal in Flowise - #VU140063
Published: July 30, 2026
Vulnerability identifier: #VU140063
CSH Severity: Medium
CVSS v4: 7.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to write arbitrary files.
The vulnerability exists due to path traversal in the S3 Directory document loader when processing attacker-controlled S3 object keys. A remote user can supply crafted S3 object keys containing traversal sequences to write arbitrary files.
Exploitation requires the `documentStores:preview-process` permission and can be performed by pointing the loader to an attacker-controlled S3-compatible endpoint via `serverUrl`.
Affected software
Flowise
Remediation
Install security update from vendor's website.
Flowise - update to 3.1.3