Would be only a hint I think ...
Found out, if I deactivate the access check in PreviewModel, than a Author is able to watch an older article via versions.
Don't understand, why the access-check is not working for a preview - the access-check for CompareModel is looking quite similar - but there are no access-errors for an author.
Changed (deactivated) lines in
administrator/components/com_contenthistory/src/Model/PreviewModel.php
`

   $user = Factory::getUser();

    // Access check
    //if (!$user->authorise('core.edit', $table->item_id) && !$this->canEdit($table)) {
    //    throw new NotAllowed(Text::_('JERROR_ALERTNOAUTHOR'), 403);
    //}` 

Hopefully somewhere is reading this with more understanding how that all is working...

thank for checking @CSGoat0 i will close this issue for now
@Rolli1962 thank you for reporting as said before i'll close it , if you still have this issue feel free to open new issue, i'll link to this one for better understanding

Have just tested with J6.1 - still the same issue.
For test-situation
a) User has only author-rights
b) User is mapped as author to an article
c) User try to overwork the article, klick the versions button and want to have a preview of an older version of this article. Still the error-message comes.

But as I have already written, if I am the lonely one who has the opinion this is a bug and should be fixed I can live with this. The workaround I have described is still working, even now with J6.1

Best - Roland

Have just tested with J6.1 - still the same issue.
For test-situation
a) User has only author-rights
b) User is mapped as author to an article
c) User try to overwork the article, klick the versions button and want to have a preview of an older version of this article. Still the error-message comes.

But as I have already written, if I am the lonely one who has the opinion this is a bug and should be fixed I can live with this. The workaround I have described is still working, even now with J6.1

Best - Roland

Have just tested with J6.1 - still the same issue.
For test-situation
a) User has only author-rights
b) User is mapped as author to an article
c) User try to overwork the article, klick the versions button and want to have a preview of an older version of this article. Still the error-message comes.

But as I have already written, if I am the lonely one who has the opinion this is a bug and should be fixed I can live with this. The workaround I have described is still working, even now with J6.1

Best - Roland

Have just tested with J6.1 - still the same issue. For test-situation a) User has only author-rights b) User is mapped as author to an article c) User try to overwork the article, klick the versions button and want to have a preview of an older version of this article. Still the error-message comes.

But as I have already written, if I am the lonely one who has the opinion this is a bug and should be fixed I can live with this. The workaround I have described is still working, even now with J6.1

Best - Roland

No, you are right @Rolli1962 .
It's a bug, I have tried again and there is 404 error.

@alikon it seems like I made a mistake, sorry.
Could you reopen this issue again? I will work on it.

Have just tested with J6.1 - still the same issue. For test-situation a) User has only author-rights b) User is mapped as author to an article c) User try to overwork the article, klick the versions button and want to have a preview of an older version of this article. Still the error-message comes.

But as I have already written, if I am the lonely one who has the opinion this is a bug and should be fixed I can live with this. The workaround I have described is still working, even now with J6.1

Best - Roland

No, you are right @Rolli1962 .
It's a bug, I have tried again and there is 404 error.

@alikon it seems like I made a mistake, sorry.
Could you please reopen this issue again? I will work on it.

Have just tested with J6.1 - still the same issue. For test-situation a) User has only author-rights b) User is mapped as author to an article c) User try to overwork the article, klick the versions button and want to have a preview of an older version of this article. Still the error-message comes.

But as I have already written, if I am the lonely one who has the opinion this is a bug and should be fixed I can live with this. The workaround I have described is still working, even now with J6.1

Best - Roland

No, you are right @Rolli1962 .
It's a bug, I have tried again and there is an error.

@alikon it seems like I made a mistake, sorry.
Could you please reopen this issue again? I will work on it.

Hi @Rolli1962, I have written a fix for this issue.
It would be nice if you can test it.
Thanks!

Hi @Rolli1962, I have written a fix for this issue at #47735.
It would be nice if you can test it.
Thanks!

Even I am already on J6.1 - have changed the script there, is running. Thanks! Will it by also changed in a J6.x version?

Even I am already on J6.1 - have changed the script there, is running. Thanks! Will it by also changed in a J6.x version?

I don't know to be honest, but in order to be merged faster I need you to mark this as tested successfully at issue tracker after signing in with your github.
Thanks for the test!

Hope I have clicked on the right field …

Best - Roland

Von: Abdelrahman Nabil @.>
Gesendet: Mittwoch, 6. Mai 2026 16:32
An: joomla/joomla-cms @.>
Cc: Roland @.>; Mention @.>
Betreff: Re: [joomla/joomla-cms] article - versions preview: No access with author-rights (Issue #39268)

https://avatars.githubusercontent.com/u/163023550?s=20&v=4 CSGoat0 left a comment (#39268) #39268 (comment)

Even I am already on J6.1 - have changed the script there, is running. Thanks! Will it by also changed in a J6.x version?

I don't know to be honest, but in order to be merged faster I need you to mark this as tested successfully at issue tracker https://issues.joomla.org/tracker/joomla-cms/47735 after signing in with your github.
Thanks for the test!

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Hope I have clicked on the right field …

Best - Roland

@Rolli1962, I appreciate your help.😊
I need you to log in to the issue tracker at https://issues.joomla.org/tracker/joomla-cms
Then navigate to https://issues.joomla.org/tracker/joomla-cms/47735
Then Press the button in the photo, mark as successful and post your comment.
Thank you!