The isVerified function in CharityRegistry contract modifies the registeredCharities mapping instead of the verifiedCharities mapping. This allows unverified charities to receive donations.
The logic of the contract is incorrect. The isVerified function should return whether the charity is verified or not. However, it returns whether the charity is registered or not. This allows unverified charities to receive donations.
Likelyhood: High, the function returns registered charities instead of verified ones. Impact: High, Any charities can be registered by anyone and will be declared as verified by this function bypassing verification.
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