The everyday Joe? No.

The Catholic Church before the Reformation was great at keeping its corruption a secret on the higher levels, but the corruption within the lower levels was less well kept.

-In local communities, if you were wealthy enough you could buy indulgences, or you could buy yourself a "clean slate." You would pay the priest, donate to the church, or the local church authority, and you could be cleared of any past wrongdoings. The logic was that you did not tell anyone you paid for being cleared, and that paying to the church was a sign of asking for forgiveness by giving money to the cause of the church. However, people did begin to figure out that local churches/officials were corrupt and selling these slates to people.

But that is not the end of the corruption.

The full grasp of corruption-

Many peasants and commoners did not know how to read in their native language, let alone in Latin- which every Bible was written in. This was more exposed by the printing press when bibles were first begun to be printed in other languages, allowing for people to be able to actually read from them. The reason this is such a large deal is that before, only the educated rich and nobility, and members of the clergy could read Latin, and could basically claim many things were in the Bible, and then conveniently allow other things to go unmentioned. This actually was covered up for a while due to the lack of education and lack of bibles until the printing press beginning to mass manufacture them, as well as literacy rates rising because of the printing press. Although I'm not sure of the exact wording of claims, many dealt with money, with the idea that the current ruler had divine power from God to rule over their country, that conditions were actually ideal and commoners should not attempt to improve them, etc.

And of course political corruptness- which even many members of the nobility and low ranking clergy did not know about. The Catholic Church was a huge power in Europe during its height, and even after- directly influencing, and could be argued to be controlling the Austrian, Spanish, and Holy Roman Empires, as well as many Italian city-states, German provinces, and before the reformation, English lands. An example of said influence over the Spanish empire was that in the Southern American colonies, natives could first be enslaved BUT the policy changed after the church declared that no converted native could be enslaved- initially against the Spanish's wishes, who eventually accepted, which combined with natives not being "suitable for physical labor" led to the growth of importing African slaves- who were deemed by the church to not be human, and not be capable of conversion.

Anyway, this political corruption lasts from directly influencing governments in Italian city-states, having links with both monarchies in established empires, as well as the governments of individual provinces and cities. the Italian city-state Florence for example had its government incredibly linked with the Catholic Church, many officials being members, or associated with members of the church- the crimes of individuals linked with the church often went unpunished or unheard of until a large amount of time had already passed.

In short- the people doing it, and very high ranking nobility were aware, as they directly benefited from the corruption. the average Joe only could know of the corruption at the local level (which was actually classed as corruption in the Catholic Church, despite it being a large source of income for many small/local churches) The corruption came in political, economic, and social "waves" and was expressed differently, and of course when the corruption began to be learned about more, we see an alternative- Protestantism begin to become popular in areas where corruption was exposed more. Even after the reformation, the Church still retained massive amounts of power, but now with a rival, and a large amount of land lost due to Protestants taking over England, ruling over Ireland, and German nobility being allowed to choose between Catholicism and Protestantism to be followed within their lands, power was lost.