After investigations, commit the proposed patch by kklimonda presented with the following introduction : cm/templates/site/login_form.html template uses a relative url for the form action, which seems to break deployment in the subfolder when trailing slash is missing (the form redirects to the upper folder breaking login). Using {% url login %} (as in the attached patch) instead would fix the issue.

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def update(obj, kwargs):

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    """

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    Update obj attributes with values from kwargs

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    """

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    for k,v in kwargs.items():

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        if hasattr(obj,k):

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            setattr(obj,k,v)

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