After WordPress, Drupal is probably one of the most popular web content creation environments. Drupal Releases Security Updates | CISA
CISA security advisories
These Cybersecurity and Infrastructure Security Agency advisories, cover a number of packages – possibly the one of most interest is Drupal – a popular website content manager, similar to WordPress. Drupal Releases Security Updates | CISA Citrix Releases Security Updates for ADC and Gateway | CISA
CISA issues advisories on Drupal and Cisco products
If you use these products then the details of the issues and updates are here: Drupal Releases Security Updates | CISA Cisco Releases Security Updates for Multiple Products | CISA