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GHSA-q5q9-2rhp-33qw

Parse Server: GraphQL `__type` introspection bypass via inline fragments when public introspection is disabled

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-30854

Packages

EcosystemPackageAffectedFixed in
npm parse-server >= 9.3.1-alpha.3, < 9.5.0-alpha.10 9.5.0-alpha.10

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact When `graphQLPublicIntrospection` is disabled, `__type` queries nested inside inline fragments (e.g. `... on Query { __type(name:"User") { name } })` bypass the introspection control, allowing unauthenticated users to perform type reconnaissance. `__schema` introspection is not affected. ### Patches The check was changed from a flat iteration over root-level selections to a recursive walk of all selection sets, detecting `__type` inside inline fragments at any depth. ### Workarounds Require master key authentication at the network layer (e.g. reverse proxy) for the GraphQL endpoint. ### References - GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-q5q9-2rhp-33qw - Fix Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.10

References

External links from the advisory. They lead to third-party sites.