Handling 403 errors in BuddyPress's new_activity_comment

Today I had a weird problem. Our BuddyPress activity stream comments were just not working. When you clicked the reply icon, then typed a response and pressed "post", it simply grayed out and never succeeded. I could see, in the logs, that there was a 403 Forbidden error being thrown.

I just debugged this and the answer is quite simple.

In your theme, somewhere, there should be a /buddypress/activity/entry.php file.

In there, you might have something like:

wp_nonce_field( 'new_activity_comment', '_wpnonce_new_activity_comment' );

This is wrong. Change it to:

wp_nonce_field( 'new_activity_comment', '_wpnonce_new_activity_comment_' . bp_get_activity_id() );

And all will be well.

Handling 403 errors in BuddyPress's new_activity_comment was originally published by Martin Paul Eve at eve.gd: Martin Paul Eve on December 10, 2025.