Security update:
The popular Java Logging utility Log4J2 contains a severe vulnerability, enabling remote code execution: Log4Shell: RCE 0-day exploit found in log4j, a popular Java logging package | LunaSec
Enonic XP does not use log4j - and is as such not affected by this vulnerabiliy.
If you have for some reason bundled Log4j in your application, you might be at risk, and should consider mitigation steps. The affected versjons of log4j are 2.0-2.14