Assuming that I understand this vbug report correctly then I cannot replicate it. Including a video so you can check I followed the instructions correctly

@brianteeman thanks for trying to reproduce the bug. The steps are correct but I can not understand from your video if the your user is assigned to the Administrator user group or to Super User. It must be different from Super User to reproduce the bug. (step 2).

the user is in the manager user group in my video

Ok. Please try to reproduce the steps with a user that is assignet only to Administrator user group. In my case I can reproduce the bug.

Thanks

still can not replicate

I cannot replicate the error, tried also frontend. I think that it is related to your system environment. @fatrr can you replcate the error on a live site (in a subdomain)?

@brianteeman
I just tryed with a new installation with softaculous in a shared hosting and I can reproduce the bug.
try from here: https://tobestack.it/administrator/index.php
user: bugtest
psw: 3QR6WA3YfYUp92g

It will ask to change the password. I don't have nothing there, only a new joomla installation and I will delete every thing when you finish to test.

the good news is that I have seen it happen on your site AND I have now replicated it on my site.

the problem is coming from the joomla text filters - will investigate further in the morning

The easiest way to test this is in global configuration go to the text filters tab and change the value for super users from "no filtering" to "default filtering" and then it will error everytime you put an accented character in the tinymce image title input and try to save the articke.

If you change the setting in the tinymce plugin for "enity encoding" to use named instead of raw then that fixes the problem without having to turn off the joomla text filters.

A customer also has the problem, he uses the JCE and when saving articles with imagesm with umlauts, the above error appears.

Part 1 of Brian's solution works (text filter), part2 does not, then the JCE mangles the filenames in the source code.

As JCE completely replaces core functionality for handling images you should raise that issue with them.

If the JCE would write past the Joomla core into the database, should the error shown here come?

Is this not rather an error in a routine that is used in the Joomla! core after the editor (whichever one) has done its job of generating code?

[18-May-2023 00:22:06 Europe/Berlin] PHP Fatal error: Maximum execution time of xxx seconds exceeded in /var/www/xxx/htdocs/libraries/vendor/joomla/string/src/phputf8/mbstring/core.php on line 43

The easiest way to test this is in global configuration go to the text filters tab and change the value for super users from "no filtering" to "default filtering" and then it will error everytime you put an accented character in the tinymce image title input and try to save the articke.

If you change the setting in the tinymce plugin for "enity encoding" to use named instead of raw then that fixes the problem without having to turn off the joomla text filters.

Hi Brian, I tested these configurations on a Joomla site (version 4.3.1 and PHP 7.4) and doesn't work. Using TinyMCE editor on administrator area, when saving a Custom HTML module or article, a similar error also occurs: when trying to use accented characters on link title:

Fatal error: Maximum execution time of 30 seconds exceeded in
/home/creativa/public_html/libraries/vendor/joomla/string/src/phputf8/mbstring/core.php on line 43

Symfony\Component\ErrorHandler\Error\FatalError:
Error: Maximum execution time of 30 seconds exceeded

at /home/creativa/public_html/libraries/vendor/joomla/string/src/phputf8/mbstring/core.php:43

Joomla 4.3.1
PHP 7.4