User can only edit own node if it has "administer nodes" permission

Hi

I've given to my authenticated users the "edit own profile" and "access content" permissions. Unfortunately, this doesn't give them the ability to edit their usernode. The url .../node/xx (where xx is the usernode page id of the user) is giving him "Access denied" response.

In order to give this ability, I must give them "administer nodes" permission which is giving too much ability.

Many thanks for your help

Laurent