Bug 1389045

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I can still reproduce with python3-flask-admin 1.4.2-3.fc26

I think the ownership in the rpm are ok, what are the problem caused by having mockbuild owning the files ?

Users are a primary mechanism of privilege separation. In particular, any files program owned by non-root users allow that user to inject code. Thus, privileges of doing stuff as mockbuild can be elevated to privileges of any other user running code which imports python-flask-admin.

The guidelines are pretty clear [https://fedoraproject.org/wiki/Packaging:Guidelines#File_Permissions]:
> Inside of /usr, files should be owned by root:root unless a more specific user or group is needed for security.

(and in this case having files owned by mockbuild decreases security, since it's not a dedicated user for this purpose, so that last clause does not apply.)

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bug reports from releases that are no longer maintained. At that time
this bug will be closed as EOL if it remains open with a Fedora  'version'
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plan to fix it in a currently maintained version, simply change the 'version'
to a later Fedora version.

Thank you for reporting this issue and we are sorry that we were not
able to fix it before Fedora 26 is end of life. If you would still like
to see this bug fixed and are able to reproduce it against a later version
of Fedora, you are encouraged  change the 'version' to a later Fedora
version prior this bug is closed as described in the policy above.

Although we aim to fix as many bugs as possible during every release's
lifetime, sometimes those efforts are overtaken by events. Often a
more recent Fedora release includes newer upstream software that fixes
bugs or makes them obsolete.

I can still reproduce with python3-flask-admin 1.5.0-3.fc28

pull request at -> 

https://src.fedoraproject.org/rpms/python-flask-admin/pull-request/4

just commenting some offending lines, in next changes we can drop them if they are not required.

python-flask-admin-1.5.0-4.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2018-fac3207a49

python-flask-admin-1.5.0-4.fc28 has been pushed to the Fedora 28 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-fac3207a49

python-flask-admin-1.5.0-4.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.