While the pledged object is temporarily with its owner and the debt remains unpaid, what may the pledgee do?

Kitab al-Rahn: Misuse, Loan Back, Liability and Death of the Pledgor

• Unilaterally extinguish the security by treating the loan back as final release
• Demand the pledged item’s return
• Sell the security to someone else without the owner’s authorization
• Increase the principal debt without a new agreement