I have the same problem. Here last log from everything.php:

2024-05-22T10:40:52+00:00 CRITICAL XXX.XXX.XXX.XXX error Uncaught Throwable of type Joomla\CMS\Router\Exception\RouteNotFoundException thrown with message "Pagina non trovata". Stack trace: #0 [ROOT]/libraries/src/Application/SiteApplication.php(754): Joomla\CMS\Router\Router->parse()
#1 [ROOT]/libraries/src/Application/SiteApplication.php(244): Joomla\CMS\Application\SiteApplication->route()
#2 [ROOT]/libraries/src/Application/CMSApplication.php(306): Joomla\CMS\Application\SiteApplication->doExecute()
#3 [ROOT]/includes/app.php(58): Joomla\CMS\Application\CMSApplication->execute()
#4 [ROOT]/index.php(32): require_once('/home/xxxxxxxx/...')
#5 {main}

I have absolutely the same problem at two websites on two different server since 17th of May. "Internal Server Error" when trying to select intro image or trying to insert image into an Article or Category. Before 17th of May both of them worked without any problem. There was not any changes on the websites (nor Joomla/Component update nor any new plugin/component install nor any server update or setting changes)
Joomla 5.1
php 8.1

Do you see something like that in the browser console?

Where are the websites hosted? Some special rules in Apache mod_security?

Hi drmenzelit,
I'm sorry but the image you wanted to post is not visible. Can you post it again?
My sites are hosted on SuppotHost dot com
Regarding your question "Some special rules in Apache mod_security?" How can I check it to reply to you?

looking at the console while I try to select an image I get this error.

(anonime) @ joomla-media-select.min.js?a034d4:27
Joomla.getMedia @ joomla-media-select.min.js?a034d4:27
modalClose @ joomla-field-media.min.js?d823e5:4
onClick @ joomla-field-media.min.js?d823e5:4

@galamarco One of our customer had the similar issue. He said disable the rule ModSecurity: collections_remove_stale from mod_security and the error is gone.

You should contact your hosting provider, ask them to do the same for your hosting account. It might/should solve the issue.

sorry here a full version of the error:

joomla-media-select.min.js?a034d4:27
GET https://www.webg.it/administrator/index.php?option=com_media&format=json&task=api.files&url=true&path=local-images%3A%2Fpowered_by.png&mediatypes=0%2C1%2C2%2C3&9c8a05836aed9771fb4067c966f172f6=1 403 (Forbidden)

(anonime) @ joomla-media-select.min.js?a034d4:27
Joomla.getMedia @ joomla-media-select.min.js?a034d4:27
modalClose @ joomla-field-media.min.js?d823e5:4
onClick @ joomla-field-media.min.js?d823e5:4

I had exactly the same error with two joomla pages. One is version 4.4.4, the other is version 5.1. The two websites are on two different servers.

@ivanti @ciaowebcoder73 @om615 please vote for this problem at the top right by ticking "I have encountered this problem" and indicating the importance you attribute to it. This way it gets the right priority. ^_^

@galamarco I already did it.

From my console:

joomla-media-select.js?a034d4:313

GET https://********/administrator/index.php?option=com_media&format=json&t…laceholder.png&mediatypes=0%2C1%2C2%2C3&40997ef…=1 404 (Not Found)
(anonimo) @ joomla-media-select.js?a034d4:313
Joomla.getMedia @ joomla-media-select.js?a034d4:294
modalClose @ joomla-field-media.js?d823e5:188
onClick @ joomla-field-media.js?d823e5:162

The problem is only present from backend, while from frontend I can select images regularly via the modal.

While waiting for a structural solution, I share that thanks to @joomdonation it has emerged that disabling ModSecurity from cPanel (or via your hosting) solves the problem.
However, disabling ModSecurity is certainly not the optimal solution, on the contrary, it exposes the site to more frequent attacks.
This is why we are waiting for a better solution.

@galamarco You should not have to disable ModSecurity completely, just disable the mentioned rule collections_remove_stale should be enough.

Same error here in a Joomla4 and Joomla 5 webistes with CPANEL. Image selection stop working a few days ago out of nothing. Can this be related to a Cpanel update? Anyway i've contacted my hosting provider to disable the rule mentioned by @joomdonation
Thanks

@drmenzelit ti confermo che vedo degli errori:

Here an example URL of first error "Failed to load resource: the server responded with a status of 403 ()":
[...] /administrator/index.php?option=com_media&format=json&task=api.files&url=true&path=local-images%3A%2Fjoomla_logo_black.jpg&mediatypes=0%2C1%2C2%2C3&a5898cd90037069bb26396fe08c96301=1

@joomdonation I discussed your proposal with the hosting but they tell me that for shared servers, disabling mentionedcollection_remove_stale is not an applicable solution. It would also affect other customers.