Submitted by panprog, also found by 0x52, 0xsanson, hansfriese, shenwilly, and zzzitron
https://github.com/code-423n4/2022-07-fractional/blob/8f2697ae727c60c93ea47276f8fa128369abfe51/src/modules/Migration.sol#L210
https://github.com/code-423n4/2022-07-fractional/blob/8f2697ae727c60c93ea47276f8fa128369abfe51/src/modules/Buyout.sol#L73
When buyout starts, it takes all fractions owned by proposer. This means that when Migration contract starts a buyout, it takes all fractions it has, not just the fractions from the proposal. This is easily exploitable by anyone.
Stealing fractions scenario:
Add this code to test/Migration.t.sol
Buyout start function should include amount of fractions a proposer deposits, and Migrations commit function should specify correct fractions amount when starting a buyout.
stevennevins (Fractional) confirmed 
HardlyDifficult (judge) commented:
