Please help me identify the plant in the attached photo.
Thank you very much for contacting the Toronto Master Gardeners. Your photo is a bit blurry but this plant looks like a type of bittersweet. Oriental bittersweet (Celastrus orbiculatus) is a woody, creeping vine, which has round to oval-shaped leaves with serrated edges. The berries have a yellow capsule that eventually splits to reveal a red, inner seed. The berries appear all along the stems, which differentiates it from the American bittersweet (Celastrus scandens), that is native to North America and has orange berries in clusters at the stem tips. Oriental bittersweet is considered invasive, can spread rapidly and out-compete native species. This article from the United States Geological Survey describes characteristics of each type of bittersweet in greater detail and may be helpful in confirming the identification for you American and Oriental Bittersweet ID.