Along with everything that's not one of the six feature films, the Clone Wars TV series and Film, they're now considered to be part of the "Legends" canon.
While Lucasfilm always strived to keep the stories created for the EU
consistent with our film and television content as well as internally
consistent, Lucas always made it clear that he was not beholden to the
EU. He set the films he created as the canon. This includes the six
Star Wars episodes, and the many hours of content he developed and
produced in Star Wars: The Clone Wars. These stories are the immovable
objects of Star Wars history, the characters and events to which all
other tales must align.
At the time of broadcast they were considered to be fully canonical ('G-Canon') alongside the three original trilogy films. They certainly fit the other G-Canon criteria in the sense that Lucas co-wrote and co-directed both films
On top of that, multiple versions of the DVD, VHS and Soundtrack CD feature a quote from Variety Magazine ("Daily Variety pronounces that Ewoks: The Battle for Endor triumphs as a worthy entrant into the hallowed Star Wars canon").
Since then, LucasFilm steadily downgraded their status to the current level of "C-Canon" as part of the Expanded Universe (e.g considered fully canon unless contradicted elsewhere by the 6 films or Clone Wars TV show) and since April 2014, they're now considered part of the "Legends" canon.