http://www.snopes.com/george-soros-ss-nazi-germany/
Wow, indeed. As hoaxes go, this one was neither plausible nor hard to disprove. Given that Soros — born in 1930 — was only nine years old when World War II began and 14 when the war ended in Europe in 1945, he couldn’t have joined the SS, whose minimum age requirement was 17, even if he had wanted to. Moreover, Soros would never have met the SS requirement for pure “Aryan” heritage. Quite to the contrary, Soros grew to adolescence as a persecuted Jew in Nazi-occupied Budapest.
The mislabeled photo is easily debunked using a reverse image search. The young man portrayed in the Waffen SS uniform is Oskar Groening, a Nazi who served at Auschwitz from 1942 through the end of World War II: