Vulnerability PYSEC-2026-4040
Summary
djust: Unsigned client state snapshot is restored as trusted view state (privilege escalation / state injection)
Details
Impact
For views that opt into state snapshots, the snapshot state_json embedded in the client page was restored on reconnect as trusted view state with no integrity check. A client could edit the unsigned state_json in their page and return it in the reconnect mount frame to inject arbitrary view attributes — e.g. flip is_admin to True, or change account_id / balance — escalating privilege or tampering with business state held in public view attributes (the normal djust pattern).
Patches
Fixed in djust 1.0.7. State snapshots are signed; unsigned or forged snapshots are rejected on the back-navigation restore path.
Workarounds
Do not enable state snapshots; do not hold authorization/ownership state in public view attributes.
Related Vulnerabilities
Other vulnerabilities affecting the same packages
