Kinto Attachment's attachments can be replaced on read-only records
### Impact The attachment file of an existing record can be replaced if the user has `"read"` permission on one of the parent (collection or bucket). And if the `"read"` permission is given to `"system.Everyone"` on one of the parent, then the attachment can be replaced on a record using an anonymous request. Note that if the parent has no explicit read permission, then the records attachments are safe. ### Patches - Patch released in kinto-attachment 6.4.0 - https://github.com/Kinto/kinto-attachment/commit/f4a31484f5925cbc02b59ebd37554538ab826ca1 ### Workarounds None if the read permission has to remain granted. Updating to 6.4.0 or
- Actualiza a 6.4.0
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