CVE-2026-55873: SeaweedFS: Improper authorization in the S3Tables / Iceberg REST management API lets a low-privileged S3 user enumerate administrator-owned table buckets

SeaweedFS routes requests signed with SigV4 service s3tables to the S3Tables management API. Authorization on that path collapsed account-less S3 identities into the shared admin account and failed open, so a user holding only ordinary S3 Read credentials — and no S3Tables-specific permission — could invoke S3Tables management operations such as GET /buckets and enumerate administrator-owned table bucket inventory (names and ARNs). The same handler backs the Iceberg REST catalog, which was affected by the same flaw.