CVE-2026-77368 SeaweedFS: Authenticated Cross-Prefix IDOR in Filer TUS Handler Enables Arbitrary Write to Tenant-Forbidden Paths

SeaweedFS is a distributed storage system for files and blobs. In version 4.39, the filer's TUS resumable-upload handler checks JWT allowedprefixes scoping only when a session is created, letting a low-privilege tenant hijack another tenant's upload session to write content to filer paths their o...

CVE-2026-77368

SeaweedFS version 4.39 contains an authenticated cross-prefix IDOR in the filer's TUS resumable-upload handler . The JWT allowed_prefixes scoping is enforced only when an upload session is created; the HEAD , PATCH , and DELETE verbs that operate on an existing session by its identifier never re-...