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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-16144
• https://owncloud.com/security-advisories/files-antivirus-doesnt-delete-virus-if-uploaded-through-public-link/