Parse Server's GraphQL "Did you mean ...?" validation suggestions disclose schema to unauthenticated callers
Exact source revision recorded 24 Oct 2026 13:17:17 UTC. It does not establish the source's current position. Latest evidence.
osv · GHSA-8cph-rgr4-g5vj
Published### Impact Parse Server's GraphQL endpoint discloses schema metadata to unauthenticated callers through `Did you mean ...?` suggestions embedded in GraphQL validation-error messages. An unauthenticated caller who knows only the public application id can iteratively send malformed queries to reconstruct class names, field names, argument names, mutation names, and input-object fields. This bypasses the `IntrospectionControlPlugin` enforced when `graphQLPublicIntrospection: false` (the default) and defeats the schema-hiding goal of prior advisories GHSA-48q3-prgv-gm4w and GHSA-q5q9-2rhp-33qw. Schema disclosure aids reconnaissance for downstream authorization probing but does not by itself leak object data or authentication material. ### Patches A new `SchemaSuggestionsControlPlugin` Apollo plugin strips the `Did you mean ...?` suffix from GraphQL validation-error messages during `validationDidStart`, which runs before any introspection gate. The plugin applies only when `graphQLPublicIntrospection: false` and the caller is not a master-key or maintenance-key holder, matching the trust model of the existing `IntrospectionControlPlugin`. ### Workarounds No code workaround is available short of disabling the GraphQL API (`mountGraphQL: false`). Operators who require disclosure-resistant validation errors should upgrade to a patched release. ### Resources - GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-8cph-rgr4-g5vj - Fix Parse Server 9: https://github.com/parse-community/parse-server/pull/10467 - Fix Parse Server 8: https://github.com/parse-community/parse-server/pull/10468
- Source published
- 29 May 2026 19:18:01 UTC
- Source modified
- 16 Jun 2026 13:26:19 UTC
- Observed here
- 24 Oct 2026 13:17:17 UTC
- Source terms
- GitHub Advisory Database · CC-BY-4.0
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CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Publisher rating · MODERATE