When using an object storage like S3 as the file store, when a user creates a public link to a folder where anonymous users can upload files, and another user uploads a virus the files antivirus app would detect the virus but fails to delete it due to permission issues. This affects the files_antivirus component versions before 0.15.2 for ownCloud.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-16144
Reference (s):
- https://owncloud.com/security-advisories/files-antivirus-doesnt-delete-virus-if-uploaded-through-public-link/