Even though CBC is more secure than ECB, it is still vulnerable to attacks without taking additional precautions like using a Message Authentication Code (MAC). Cryptopals Set 2 Challenge 16.
Yet Another demonstration of why you shouldn't use ECB, even when some random-sized block of padding is prepended to the message. Cryptopals Set 2 Challenge 15.
Yet Another demonstration of why you shouldn't use ECB, even when some random-sized block of padding is prepended to the message. Cryptopals Set 2 Challenge 14.
We demonstrate how to perform ECB decryption one byte at a time, a good demonstration of why ECB should not be used in practice. Instead, use CBC! Cryptopals Set 2 Challenge 12.