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Fuente: https://www.joomla.org/announcements/release-news/5814-joomla-3-9-20.html

.9.20 is now available. This is a security release for the 3.x series of which addresses 6 security vulnerabilities and contains over 25 bug fixes and improvements.

What's in 3.9.20?
Joomla 3.9.20 includes 6 security vulnerability fixes and addresses several bugs, including:

Security Issues Fixed
Low Priority – Core – CSRF in com_installer ajax_install endpoint (affecting Joomla! 3.7.0 through 3.9.19) More information »
Moderate Priority – Core – Missing checks can lead to a broken usergroups table record (affecting Joomla! 2.5.0 through 3.9.19) More information »
Low Priority – Core – CSRF in com_privacy remove-request feature (affecting Joomla! 3.9.0 through 3.9.19) More information »
Low Priority – Core – Variable tampering via user table class (affecting Joomla! 3.0.0 through 3.9.19) More information »
Low Priority – Core – Escape mod_random_image link (affecting Joomla! 3.0.0 through 3.9.19) More information »
Low Priority – Core – System Information screen could expose redis or proxy credentials (affecting Joomla! 3.0.0 through 3.9.19) More information »
Bug fixes and Improvements
Upload & tab of Joomla Update Component: Fix to allow upload of ZIP filetype only #29877
Local database server: Allow optional port numbers #29567
Beez3 Template: Markup fix for the Tabs layout of com_contact #29636
Beez3 Template: Allow custom field editing on frontend #29577
Backend cache cleared when purging updates #29603