Atlassian mentions in their original advisory[0] that Cloud is not vulnerable. But Atlassian usually just... leaves it at that. No clarification on if Cloud was ever vulnerable in the past or whether there was any evidence of exploitation attempts on Cloud customers. Something I wish they would provide more details on as my company is also an Atlassian customer.
[0]: https://confluence.atlassian.com/security/cve-2023-22515-pri...