misattribution

noun

mis·​at·​tri·​bu·​tion ˌmis-ˌa-trə-ˈbyü-shən 

plural misattributions

: an incorrect attribution (as for a piece of artwork)

For decades this portrait had suffered one misattribution after another. More recently the artist had been listed as unknown.

—James G. Barber

Word History

First Known Use

1865, in the meaning defined above