CVE-2026-109303
Medium
Description
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.
SeverityMedium
CVSS4.3
Exploit probability—
ProductParse-community Parse-server
PublishedOct 12, 2026
First seenOct 12, 2026
How to fix
Update
- parse-community parse-server9.10.1-alpha.13, 8.6.93 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| parse-community parse-server | 9.0.0 ≤ v < 9.10.1-alpha.13, v < 8.6.93 | 9.10.1-alpha.13, 8.6.93 |
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