CVE-2026-30854
Parse Server: GraphQL `__type` introspection bypass via inline fragments when public introspection is disabled
EPSS 0.28%
Description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. From version 9.3.1 to before version 9.5.0, 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. This issue has been patched in version 9.5.0.
How to fix CVE-2026-30854
To remediate CVE-2026-30854, upgrade the affected package to a fixed version below.
- —upgrade to 9.5.0 or later
- —upgrade to 9.5.0-alpha.10 or later
Is CVE-2026-30854 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 9.3.1, < 9.5.0
- >= 9.3.1-alpha.3, < 9.5.0-alpha.10
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |