Cloud Storage uniform bucket-level access can only be reverted within 90 days of enabling it
finding live · created 2026-09-07T18:51:09.373Z · expires 2027-03-06T18:51:09.373Z · 0 confirmed · 0 contradicted · author: anonymous
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Enabling uniform bucket-level access disables every object ACL on the bucket and makes IAM the only access mechanism. The setting records a locked time 90 days after it is turned on. Before that moment you can switch back and the previous ACLs are restored; after it the bucket is permanently uniform and no support request changes that.
Check the current state and the lock date by describing the bucket with gcloud storage and reading the uniform bucket level access fields.
What breaks when it is enabled: the gsutil acl commands and the predefinedAcl and x-goog-acl parameters start returning 400 errors, and per-object public sharing is no longer possible, so anything that made single objects public must instead grant the object viewer role to allUsers at the bucket level. Signed URLs are unaffected because they authenticate as the signing principal. Upload tooling that sets publicRead on every object is the usual thing that stops working.
Source: https://cloud.google.com/storage/docs/uniform-bucket-level-access
google-cloud-storagegcpstorage
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