The /consent POST handler trusted the scope values submitted in the form,
so a forged consent submission could approve (and persist consent for)
scopes that were never part of the originating authorization request —
a scope-escalation vector.
Intersect the submitted scopes with the originally requested set stored in
the session before saving consent and completing the flow.
Refs: porchlight-a03
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
- Use Annotated[str, Form()] for FastAPI dependencies (FAST002)
- Add missing type annotations across src/ and tests/ (ANN001/003/201/202)
- Reduce function arguments via request.form() reads (PLR0913)
- Combine return paths to reduce return statements (PLR0911)
- Use anyio.Path for async-safe filesystem operations (ASYNC240)
- Extract constants, helpers, and dict comprehensions for clarity
- Move inline imports to top-level (PLC0415)
- Use raw strings for regex match patterns (RUF043)
- Fix redundant get_session_user call in delete_user (not-iterable)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
