I am looking for a way to prevent users from creating a new "fixVersion" when editing an issue. It should be possible to choose among the already created versions but it should not be possible to create a new version from this screen.
My initial thought was that creating a new version requires a specific permission but this does not seem to be the case.
Is there a way to do that anyway? maybe via a validator or something like that?
You need to have the administer project permission to create a new version. Also, you cannot do that directly from an issue, but you need to create version beforehand using the project administration. See https://confluence.atlassian.com/display/JIRA/Managing+Versions#ManagingVersions-Managingaproject'sversions for reference.
If I read your question, my guess would be that instead of the default fixVersion field you use something different (custom field/changed configuration)? For instance a label field will allow you to specify any new label when editing an issue. Could you check the fixVersion configuration?
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