Submitted by __141345__
https://github.com/code-423n4/2022-12-tigris/blob/588c84b7bb354d20cbca6034544c4faa46e6a80e/contracts/BondNFT.sol#L177-L183 
https://github.com/code-423n4/2022-12-tigris/blob/588c84b7bb354d20cbca6034544c4faa46e6a80e/contracts/BondNFT.sol#L235-L242
In BondNFT.sol#claim(), accRewardsPerShare[][] is amended to reflect the expired shares. But only accRewardsPerShare[bond.asset][epoch[bond.asset]] is updated. All the epochs between bond.expireEpoch-1 and epoch[bond.asset] are missed.
However, some users claimable rewards calculation could be based on the missed epochs. As a result, the impact might be:
The rationale behind the unchecked block below seems to take into account the shares of reward of the expired bond. However, if you only update the latest epoch data, the epochs in between could have errors and lead to loss of other users.
Users can claim rewards up to the expiry time, based on accRewardsPerShare[tigAsset][bond.expireEpoch-1]:
TriHaz (Tigris Trade) acknowledged, but disagreed with severity and commented:
Alex the Entreprenerd (judge) decreased severity to Medium and commented:
GainsGoblin (Tigris Trade) commented:
