Adobe has released a new security update on the 13.2.
https://helpx.adobe.com/security/products/magento/apsb24-03.html
We found it yesterday on the Zest blog. So that was very late, hopefully not too late.
We actually thought we always got warnings into the backend, but not this time though.
Is this an error, or did Adobe stop triggering news into the installations?
They now have a release schedule and you can plan your upgrades and security patches for years in advance - https://experienceleague.adobe.com/docs/commerce-operations/release/planning/schedule.html?lang=en#