International standards relating to a professor publishing a student's thesis work without the student as co-author I am looking for international standards that speak specifically of a professor taking the thesis work of an ex-student that they had supervised and publishing a journal paper on that work (and just that work) without the student's name.

This relates to a specific case that I am aware of where the official university finding essentially admits that the aforementioned incident did indeed take place (it is largely undeniable), and quotes some generic definitions and policies regarding plagiarism, but finds that the aforementioned incident does not imply plagiarism and/or academic misconduct (due mainly to a supposition that the student did nothing more than grunt work, which I don't believe to be true at all, which contradicts the university's own expectations for the academic title obtained by the student, etc.).

The finding is an obvious attempt to sweep the case under the carpet.

However, the fact that this is clearly a case of plagiarism is sort of "folklore" to me and I cannot find something authoritative to back it up (lots of blog posts, etc., but no statement that speaks specifically to this sort of case written by an authority that an official from a well-respected university would be reluctant to explicitly discount or contradict). 

Aside from my gut, my question then is: does this sort of scenario constitute plagiarism and/or academic misconduct with respect to some specific international standard?

(I would very much appreciate answers with pointers to a statement from a well-known professional organisation, reputable university, high-profile journal, etc. The specific area is Computer Science, just in case.)
There is no international standard because authorship practices vary.  

COPE is the closest thing to a standards organization, but they do not publish authorship standards, or any other kind of standard.  

References:

https://publicationethics.org/files/Recognise_Potential_Authorship_Problems.pdf

https://publicationethics.org/files/u7141/best_practice_for_issues_around_theses_publishing%20(1).pdf

Academia varies more than you think it does – The Movie (why there are no standards)

Publishing a student's thesis without their name is certainly unethical.