Please ask on Forum as this Repository is for coding.

I'm using Firefox and noticed this issue too on several sites using different templates recently, (including official properties).

If this just started happening #24637 might have something to do with it.

Can anyone test after reverting #24637 ?
I can't reproduce the issue here.

@iqmedien can you please test as @infograf768 suggest above?

I can't reproduce this problem with firefox... @Sandra97 on all joomla properties? I tried j.org and it works for me with ff 67....

Create a sub-directory of "images" under the main images directory.
Create a sub-directory of "testing123" under that directory.

Update the plugin: Editor - TinyMCE
Make sure you are editing tab "Set 0" so Administrator is showing in the groups that use this profile.
Under the "Images Directory" setting, select "images/testing123" (save & close)

• the actual path on the server is "images/images/testing123"

Go under content, and articles and either create a new or edit an existing.

Drag and Drop an image into the content window.
You should receive an error the file can not be uploaded, showing the filename as undefined.

However, if you create a directory inside the "root" images directory of "testing123" and attempt to drag and drop the image again, it will upload. However, it will be in the "images/testing123" directory, not the actual "images/images/testing123" directory specified under the TinyMCE plugin setting.

I believe this is what is being reported.

Create a sub-directory of "images" under the main images directory.
Create a sub-directory of "testing123" under that directory.

Update the plugin: Editor - TinyMCE
Make sure you are editing tab "Set 0" so Administrator is showing in the groups that use this profile.
Under the "Images Directory" setting, select "images/testing123" (save & close)

• the actual path on the server is "images/images/testing123"

Go under content, and articles and either create a new or edit an existing.

Drag and Drop an image into the content window.
You should receive an error the file can not be uploaded, showing the filename as undefined.

However, if you create a directory inside the "root" images directory of "testing123" and attempt to drag and drop the image again, it will upload. However, it will be in the "images/testing123" directory, not the actual "images/images/testing123" directory specified under the TinyMCE plugin setting.

I believe this is what is being reported.

oh, then it would have to do with a double images/images/ directory?

I guess it would be relative to what you have set as the "path to files" or "path to images" folder settings under the media global configuration.
You could possibly have a different directory specified, and then the issue would pop up if you had a nested directory of the same name.

It might sound odd to some people but I have a couple clients that have images sub-directories setup under the root images directory. They also have PDF and Video directories as well.

@HLeithner Not on all, it was on one, but I'm unable to tell you which one as I work on several. I just did tests on 3 official properties but I was unable to reproduce the issue (note that it wasn't happening all the time)

This bug was introduced in 2017 by #15057 and is now in affect because of the security fix in #24637.

Now it should be fixed with #25037