3.3.12

3.3.12 is a security release. It closes an open redirect in the timeslider's "Return to pad" button (GHSA-35rj-7vrx-29wq) and stops revision-bound .etherpad exports from leaking later chat.

Security

• Timeslider — "Return to pad" no longer follows a cross-origin referrer (GHSA-35rj-7vrx-29wq). The button navigated to document.referrer whenever the character before its last / was p, so a link from https://attacker/p/login to /p/<pad>/timeslider?embed=1 sent the user back to the attacker's site when they clicked it. The referrer is now only followed when it is a pad page on the same origin; otherwise the button returns to the pad. Reported by @sun1024.
• Export — revision-bound .etherpad exports only include chat up to that revision. Exporting /p/<pad>/<rev>/export/etherpad shipped the pad's entire chat history, including messages posted after that revision. Reported by @temantih.