A file picker does not make server input trustworthy. Enforce size, format, ownership and processing rules server-side.
Evaluation approach
Never use supplied filenames directly as storage paths. Run parsers and renderers with limited privileges.
Application example
Only the authorized account should access an uploaded identity document. Keep contents and access links out of error logs.
Limits and considerations
Application integrity does not establish file safety or ownership.
Why limit parser privileges?
A processing component usually does not need every server file or secret. Resource limits and narrow privileges help contain parser failures.
Checks and decisions
- Limit size
- Verify formats
- Bind access to accounts
Sources
The primary references above provide the technical basis. Example workflows and evaluation suggestions are this publication’s explanations, not independent test results for a particular product.