Highlights
CSRF Protection: 1 prior fix. Scrutinize any change in this area.
formtools/preview.py: most-fixed (1 issue). Treat as high-risk during review.
1 high-severity fix in this history; regressions here are high-impact.
Recurring patterns
The bug types that recur here, drawn from past fixes, not open vulnerabilities.
CSRF Protection: The FormWizard's POST handler lacked CSRF protection, allowing cross-site request forgery on state-changing form submissions. This is a classic high-impact flaw for multi-step forms.
Timing Attack (MAC comparison): The preview security hash was compared with a non-constant-time string equality, enabling timing side-channel attacks to recover the hash. Low severity but relevant for any security-token verification.