CVE-2026-109303 Parse Server before 8.6.93 and 9.0.0 before 9.10.1-alpha.13 protectedFields Bypass via Relation Count Query
Authenticated users can bypass protectedFields restrictions on relation count queries to reveal confidential membership data in Parse Server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-109303?
CVE-2026-109303 is a medium-severity missing authorization vulnerability in parse-community parse-server, published on 12 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-639
Which versions are affected by CVE-2026-109303?
1 open source package ship an affected version, including parse.
| Package | Affected | Fixed in |
|---|---|---|
parse Bitnami | All versions | 8.6.93, 9.10.1 |
How do I fix CVE-2026-109303?
Upgrade parse to a fixed version for your release line: 8.6.93 or 9.10.1.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-109303 being exploited?
There is no known exploitation of CVE-2026-109303 in the wild and no public exploit code.
Sources
Also known as BIT-parse-2026-109303, GHSA-pq6r-p5vh-4c89, GHSA-rmhf-xv62-rm99.