medium4.3
CVE-2026-109303
Parse Server before 8.6.93 and 9.0.0 before 9.10.1-alpha.13 does not enforce identity-scoped protectedFields (authenticated, role, or per-user groups) on count…
Impact
Parse Server before 8.6.93 and 9.0.0 before 9.10.1-alpha.13 does not enforce identity-scoped protectedFields (authenticated, role, or per-user groups) on count queries using the $relatedTo operator, exposing the size of protected Relation fields. An authenticated user who can read the owning object can combine counts with an objectId constraint as a membership oracle to reveal confidential memberships such as private groups or block lists.
Affected products
| Product | Affected versions |
|---|---|
| Parse Server | before 8.6.93 |
| 9.0.0 | before 9.10.1-alpha.13 |
Versions were read from the advisory text. No structured product data has been published for this record yet.