No. Junglewise Threat Intelligence has no report of CVE-2018-16551 being exploited in the wild.
How severe is CVE-2018-16551?
Low severity, with a CVSS score of 3, published 13 May 2022.
Which products and versions are affected?
lavalite/cms (Packagist) ECOSYSTEM:introduced=0.
Is there a fix for CVE-2018-16551?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2018-16551?
Check whether you run lavalite/cms (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.