The OCI registry's cross-repository blob mount checked the target package against the token's "public-only" restriction, but checked the source blob only against the full account permissions of the token owner. A "public-only" token with "write:package" scope, whose owner can read a private package and write to a public package namespace, could mount a blob of the private package into the public package. The private blob, such as a container layer, could then be downloaded by anyone through the public package.