Is a cross spider venomous

These Spiders, and all spiders that weave spiral webs, do have venom, but the venoms of the spiral web weavers is not so strongly toxic that it poses any threat to the lives of human beings. Their bites are not even regarded as being particularly painful.

Spiral web weavers generally bail out if their webs are disturbed by anything much bigger than they are. About the only way that somebody might get bitten would be to blunder into a web and knock the spider down the neck of one's shirt or sweater. Of course anybody who reached out and grabbed on that was resting on her web should probably expect to get bitten.