Update post “A” on comment submition on post “B”

Hello and thanks in advance for any help. Im trying to update the post status from a post when submiting a comment on other post, I have a variable in the url pointing to the ID of the post I want to update like so mysite.com/some-post/?id=1234

Hooking into ‘comment_post’ wont get the variable, so a new post is created insted of updating

Any idea would be much appreciated