CVE-2026-30854CWE-863

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

Medium · published March 7, 2026

CVSS v4.0
6.9
EPSS
0%
Percentile
26.9
In the wild
Unconfirmed
What it is

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. From version 9.3.1-alpha.3 to before version 9.5.0-alpha.10, 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-alpha.10.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
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
EPSS
0.00346 · 26.9th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-03-07T16:24Z
EPSS history
Timeline
  • 07 MAR 16:24Z
    Parse Server: GraphQL `__type` introspection bypass via inline fragments when public introspection is disabled
    cvelistv5