Joomla! Core is prone to a security bypass vulnerability. Exploiting this issue may allow attackers to perform otherwise restricted actions and subsequently gain control over the CMS installer. Joomla! Core versions ranging from 1.0.0 and up to and including 3.7.3 are vulnerable.
Upgrade to version 3.7.4 or higher.
WordPress Plugin Countdown Block Security Bypass (1.1.1)
WordPress Plugin Thrive Dashboard Security Bypass (22.214.171.124)
WordPress Plugin WP Munich Blocks-Gutenberg Blocks for WordPress Security Bypass (0.7.2)
WordPress Plugin WP Print Friendly Security Bypass (0.5.2)
WordPress Plugin Woody ad snippets-Insert Header Footer Code, AdSense Ads Multiple Vulnerabilities (2.2.4)