langflow has Unauthenticated IDOR on Image Downloads

### Summary The `/api/v1/files/images/{flow_id}/{file_name}` endpoint serves image files without any authentication or ownership check. Any unauthenticated request with a known flow_id and file_name returns the image with HTTP 200. ### Details `src/backend/base/langflow/api/v1/files.py:138-164` , `download_image` takes `flow_id`: UUID as a bare path parameter with no Depends(get_flow) or `CurrentActiveUser`. All other file routes (`download_file`, `upload_file`, `list_files`, `delete_file`) use `Depends(get_flow)` which enforces both authentication and ownership. There is no global auth middleware on /api/v1; protection is per-endpoint only. ### PoC ``` curl -v "http://localhost:7860/api/v1/files/images/<flow_uuid>/<filename.png>" # Returns HTTP 200 with image bytes, no auth header required ``` ### Impact Unauthenticated cross-tenant data leak. In a multi-tenant deployment, any attacker who can discover or guess a `flow_id` (UUIDs can be leaked through other API responses) can download any user's uploaded images without credentials.

CVSS 3.1

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

Severity from

GitHub (reviewed advisory)

Weakness

CWE-284, CWE-639, CWE-862

Also known as

CVE-2026-33484, PYSEC-2026-80

• github.com/langflow-ai/langflow/security/advisories/GHSA-7grx-3xcx-2xv5
• nvd.nist.gov/vuln/detail/CVE-2026-33484
• github.com/langflow-ai/langflow
• github.com/pypa/advisory-database/tree/main/vulns/langflow/PYSEC-2026-80.yaml