Accounts on old forums - disable?

My account on the old forum contains an old password that has been compromised, but I am unable to change it. I’m not worried about security issues (all my other passwords are updated), rather a potential spam attack on the forum using those outdated credentials (i.e. somebody logging in is still able to post - and could spam the forum with my username still on it).

Is there the possibility to permanently disable that old account? After all it won’t serve me anymore, since the opening of discourse all older forums exist only as database and legacy, but I guess no more active discussions will take place there…

Thank you in advance.


I thought all sign-ins were disabled on the old forum already?

nope, I could still sign in with my old credentials