#3766 - Security error

Identifier #3766
Issue type Major issue (breaks an entire feature)
Title Security error
Status Completed
Handling member Chris Graham
Addon news
Description Fresh install via automatic install. Created a new, tried to upload an image an couldn't. Gallery images work fine.
Tried uploading an image via the advanced wysiwyg uploader, then tried the simplified one.
When submitting a new news, tried uploading an image via the advanced dropdown, then chose image. While the image appeared to be on the server, it was not available to be used in the image field under the advanced dropdown. Similar issue when uploading an image via the attachment option, nothing is visible in the wysiwyg. However when I click on the 'attachment manager' link the images are there, but when i click on the 'choose thumbnail manually' in the 'advanced manager popup, I get the following error "Security error" (on a white screen).

Again this is a clean install running on a shared server, tried in PHP 7.0, 7.1 and 7.2. Same issue. Running Composr 10.0.22

Steps to reproduce

Funded? No
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