[Release] Checkmk stable release 2.1.0p28

No, we haven’t released the Werk yet.
We usually try to be very specific in the Security Werks, so in case of high or critical rated vulnerabilities we hold back that info shortly before or after the release. Unfortunately the builds for 2.0 and 2.2 are not finished yet. But they are coming soon, then the Werk will be published. (This process is not used very often so it is not perfect)

FYI the CVSS vector is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H 8.3 (High) and the CVE is/will be CVE-2023-31208. We have found that internally and we know of no exploitation.