format_validation_errors interpolated Pydantic error messages directly into
HTML. Some messages echo user input (e.g. "Invalid group name '<name>'"), so
a crafted group name was reflected as raw HTML — a stored/reflected XSS.
HTML-escape each formatted message before interpolation.
Refs: porchlight-due
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>
Add BCP 47 locale validator to ProfileUpdate, UsernameInput model,
GroupListInput model, PasswordSet/PasswordChange with zxcvbn strength
checking, and shared format_validation_errors HTML helper.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
