CVE-2026-30854 MEDIUM

CVE-2026-30854: Parse Server: GraphQL `__type` introspection bypass via inline fragments when public introspection is disabled

Vendor Parse-Community
Product parse-server
Weakness CWE-863 · Incorrect authorization
Published March 7, 2026
Last update March 9, 2026
View on NVD All CVEs

CVSS base score

6.9/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 7, 2026 CVE published
March 9, 2026 Record updated