All versions of Confluence Data Center and Server are affected by this unexploited vulnerability. There is no impact to confidentiality as an attacker cannot exfiltrate any instance data. Atlassian Cloud sites are not affected by this vulnerability. If your Confluence site is accessed via an atlassian.net domain, it is hosted by Atlassian and is not vulnerable to this issue.
View the template here CVE-2023-22518.yaml
References:
https://nvd.nist.gov/vuln/detail/CVE-2023-22518