Malicious code has been identified in specific versions of the MailBee package distributed via NuGet. The affected versions are 12.3.1, 12.3.2, 12.3.3, 12.3.4, and 12.3.5. This issue is classified as a malicious package threat rather than a traditional software vulnerability. There is no CVSS score or detailed impact analysis available. No known exploits in the wild have been reported. No patch or remediation information is provided in the source data.