CVE-2026-30854: Parse Server GraphQL `__type` Introspection Bypass Vulnerability

MODERATE
Advisory Identifier: GHSA-q5q9-2rhp-33qw
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CWE-863
Published
Advisory Summary

CVE-2026-30854 is a MODERATE graphql `__type` introspection bypass vulnerability (CWE-863: Incorrect Authorization) affecting Parse Server libraries in the npm ecosystem. The issue involves graphql `__type` introspection bypass via inline fragments when public introspection is disabled. Remediation is available by upgrading affected packages to version 9.5.0-alpha.10.

CVE-2026-30854 at a Glance

CVE Identifier CVE-2026-30854
GHSA Identifier GHSA-q5q9-2rhp-33qw
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-863: Incorrect Authorization
Affected Product Parse Server
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-30854

To remediate this vulnerability, upgrade all affected Parse Server dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

parse-server fixed: 9.5.0-alpha.10 
npm install parse-server@9.5.0-alpha.10
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls parse-server

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-30854, inspect your project dependencies using npm:

npm ls parse-server

Analyze the terminal output to locate any version of Parse Server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 9.5.0-alpha.10), your application is affected.

Note: The npm ls parse-server command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. In Parse Server, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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

CVE-2026-30854 Affected Parse Server Versions

1 component(s)
Fixed Versions:
9.5.0-alpha.10
Product / Package Ecosystem Affected Versions Fixed Version
parse-server
npm/parse-server
npm
≥ 9.3.1-alpha.3
< 9.5.0-alpha.10
9.5.0-alpha.10

References

GitHub Advisory / Wiki ADVISORY
https://github.com/parse-community/parse-server/security/advisories/GHSA-q5q9-2rhp-33qw
NVD — CVE-2026-30854 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-30854
Parse Server Source Repository REPOSITORY
https://github.com/parse-community/parse-server

Frequently Asked Questions

What is CVE-2026-30854?
CVE-2026-30854 is a security vulnerability in Parse Server involving GraphQL `__type` introspection bypass via inline fragments when public introspection is disabled under CWE-863: Incorrect Authorization.
Which Parse Server versions are affected?
Affected versions include releases prior to 9.5.0-alpha.10 across affected packages: parse-server.
What version fixes CVE-2026-30854?
Upgrading to 9.5.0-alpha.10 (or the latest patched release for your respective branch) resolves the vulnerability.
Is parse-server affected?
Yes, parse-server is affected in releases prior to 9.5.0-alpha.10. Upgrade your dependency to 9.5.0-alpha.10 or later.
What CWE is associated with CVE-2026-30854?
CVE-2026-30854 is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).
How can I check npm dependencies for CVE-2026-30854?
Run the dependency tree command: 'npm ls parse-server'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-q5q9-2rhp-33qw",
  "modified" : "2026-03-09T17:42:17Z",
  "published" : "2026-03-09T17:42:17Z",
  "aliases" : [ "CVE-2026-30854" ],
  "summary" : "Parse Server: GraphQL `__type` introspection bypass via inline fragments when public introspection is disabled",
  "details" : "### Impact\n\nWhen `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.\n\n### Patches\n\nThe 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.\n\n### Workarounds\n\nRequire master key authentication at the network layer (e.g. reverse proxy) for the GraphQL endpoint.\n\n### References\n\n- GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-q5q9-2rhp-33qw\n- Fix Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.10",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "parse-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.3.1-alpha.3"
      }, {
        "fixed" : "9.5.0-alpha.10"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/security/advisories/GHSA-q5q9-2rhp-33qw"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-30854"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/parse-community/parse-server"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-09T17:42:17Z",
    "nvd_published_at" : "2026-03-07T17:15:52Z"
  }
}