This update for postgresql15 fixes the following issues:

Updated to version 15.3:
  - CVE-2023-2454: Fixed an issue where a user having permission to
    create a schema could hijack the privileges of a security definer
    function or extension script (bsc#1211228).
  - CVE-2023-2455: Fixed an issue that could allow a user to see or
    modify rows that should have been invisible (bsc#1211229).
  - Internal fixes (bsc#1210303).