contracts/Contribution.sol

@@ -49,7 +49,7 @@ contract Contribution is Initializable {
   event ContributionVetoed(uint32 id, address vetoedByAccount);
 
   modifier onlyCore {
-    require(contributorContract.addressIsCore(msg.sender), "Core only");
+    require(contributorContract.addressIsCore(tx.origin), "Core only");
     _;
   }
 

contracts/Contributor.sol

@@ -32,7 +32,7 @@ contract Contributor is Initializable {
   event ContributorAdded(uint32 id, address account);
 
   modifier onlyCore {
-    require(addressIsCore(msg.sender), "Core only");
+    require(addressIsCore(tx.origin), "Core only");
     _;
   }
 

contracts/Reimbursement.sol

@@ -38,7 +38,7 @@ contract Reimbursement is Initializable {
   }
 
   modifier onlyCore {
-    require(contributorContract.addressIsCore(msg.sender), "Core only");
+    require(contributorContract.addressIsCore(tx.origin), "Core only");
     _;
   }