[2.4.0] Checkmk Werk 16618 created: Fix XSS in graph rendering

[//]: # (werk v2) # Fix XSS in graph rendering key | value ---------- | --- date | 2024-04-04T14:24:50+00:00 version | 2.4.0b1 class | security edition | cre component | wato level | 1 compatible | yes Prior to this Werk a service name with html tags lead to cross site scripting in the graph rendering. We found this vulnerability internally. **Affected Versions**: Only 2.3.0 is affected, older versions are NOT affected. **Vulnerability Management**: We have rated the issue with a CVSS Score of 4.6 (Medium) with the following CVSS vector: `CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N`. We assigned CVE-2024-2380 to this vulnerability. **Changes**: This Werk changes the encoding engine to use our customized JSON encoder.