Background
Use of a relation of the form: relation folder: folder | folder#parent with an arrow such as folder->view can cause LookupSubjects to only return the subjects found under subjects for either folder or folder#parent.
This bug only manifests if the same subject type is used multiple types in a relation, relationships exist for both subject types and an arrow is used over the relation.
Impact
Any user making a negative authorization decision based on the results of a LookupSubjects request with version before v1.30.1 is affected.
Workarounds
Avoid using LookupSubjects for negative authorization decisions and/or avoid using the broken schema.
References:- https://github.com/authzed/spicedb/security/advisories/GHSA-j85q-46hg-36p2
- https://github.com/authzed/spicedb/commit/a244ed1edfaf2382711dccdb699971ec97190c7b
- https://nvd.nist.gov/vuln/detail/CVE-2024-32001
- https://github.com/authzed/spicedb/releases/tag/v1.30.1
- https://github.com/advisories/GHSA-j85q-46hg-36p2