Ajax validation issue for user auto-complete

[Robkk]

Context:
On the “Edit Topic” screen, there’s an “Author Information” box including an ID field. When you begin to type text into this box, the admin-ajax action “bbp_suggest_user” should auto-suggest potentially matching users.

Issue:
The user autosuggest is not returning any users, just “-1”. Having dug into the code, the step that’s failing is wp_verify_nonce() in check_ajax_referrer(), which is invoked on line 745 of bbPress file includes/admin/admin.php. The nonce is making it into wp_verify_nonce, but is not matching any expected/acceptable value – so wp_verify_nonce falls out the bottom with a failure.

If I remove the check_ajax_referrer step, the Edit Topic user auto-suggestion works perfectly so it’s definitely the nonce validation step that’s the problem.

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Just straight up copied from this ​topic

[thebrandonallen]

This is a copy-pasta mistake when the nonces were backported to the 2.5 branch. Marking as fixed for in 2.6.

[johnjamesjacoby]

Assigning all closed & unassigned tickets in the 2.6 milestone to myself.