The Kunena team is thrilled to announce the final release of Kunena 5.2.3, a native Joomla extension for Joomla 3.9. This version addresses most of the issues that were discovered in K 5.2 and issues discovered during the last development stages.You need Joomla 3.9 to run Kunena 5.2.3, the minimal requirement for Php has been increased to 7.0.4. Kunena 5.2.3 can runs too with Php 8.0.For users of template Blue eagle5 v1.6.2, please wait the release of Blue eagle5 v1.6.3 before updating Kunena to 5.2.3.What's different?Upgrading to K 5.2.3 involves changes that may affect Kunena's interoperability with other extensions installed on your site. For this reason it is advisable that you first test K 5.2 on a test site before you upgrade your live production site(s). At this stage the team is not treating interoperability with other Joomla extensions as the topmost priority. The main priority at this time is about installation/upgrade and operability as a standalone Joomla component.Main changes in K5.2.3 : 

• Variable escaped {KunenaFactory::getProfile() in quote
• When enabling Easysocial integration in Kunena the username of user has disppear
• #7573: Subscription New Topics - notification is sent for each new message
• When enabling Jomsocial integration in Kunena the username of user has disppear
• When do a clean install of Kunena you aren't redirected to the install page
• #7875: [CKEditor] The attachment button Insert All duplicates the content of the posts
• #7930: Error 500 string to array conversion
• #7859: Reason for editing is hidden
• #7923: Poll in cat which contain subcategories aren't possible #7923
• #7919: Trying to get property 'userid' of non-object profile.php
• #7917: Trying to get property 'userid' of non-object profile.php
• #7913: Topic Template:Call undefined method KunenaUser::getName()
• #7869: Topic template - Options from the modal will not Implement
• #7845: enabling CB integration plugin errors (Part 2)
• Update part to check Php extensions because was duplicated
• Not possible to display a tweet on a message with blue eagle
• Missing setting for custom config file in crypsisb3 and b4
• #7857 : Crypsisb3 and b4 | The poll symbol not available category
• Check for ckeditor custom config file was wrong template (Part 2)
• Check for ckeditor custom config file was wrong template params
• Undefined variable: bigicon in /kunena/icons/icons.php line 1357
• Disable SpellChecker from Ckeditor to let the browser handle it
• Fix in case using parameters on CBForums plugin to sideprofile
• The changelog is a PHP file
• #7845: enabling CB integration plugin errors
• Add check for php extensions during Kunena installation
• Add a template params to load a custom config file for ckeditor
• #7933: Type mismatch in libraries/bbcode/bbcode.php
• Update CKeditor to 4.16.0
• Avoid to put line return on icons in Ckeditor
• Update fontawesome to 5.15.2

 See full changelog here: https://github.com/Kunena/Kunena-Forum/tree/5.2.3