Stop comments on closed entries

https://codex.www.ads-software.com/Combating_Comment_Spam

The problem isn’t the spam. I just want to know how is possible to submit a comment in a closed entry.

Is this a WordPress security issue?

Detailed explanation: https://codex.www.ads-software.com/Combating_Comment_Spam/FAQ#I_have_disabled_comments.2C_but_comments_continue_to_be_posted

https://www.ads-software.com/support/topic/spam-comments-still-being-posted-even-tho-disabled

Yes, I read it, but I don’t want to disable the comments form. Just avoid receiving comments on closed entries. Just this :-S

Also the forum post you linked isn’t resolved, so this is a security bug.

I don’t think it’s a bug, but I might be wrong. ??
“Spammers often access comments.php directly.”
I don’t know how else to help you. I wish you all best and to get the answers you’re looking for.