Vulnerability · Published Jul 24, 2026 · Assigned by VulnCheck
CVE-2026-66009Parse Server 9.0.0 Information Disclosure via GraphQL Error Messages
Medium 6.3
In plain English
A medium-severity security flaw in parse-server from parse-community. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities).
Official description
Parse Server versions >= 9.0.0 before 9.10.0-alpha.5 and >= 8.2.2 before 8.6.86 return GraphQL validation error messages that name required custom input fields even when public introspection is disabled (graphQLPublicIntrospection: false, the default). A client holding only the public application id — with no user session, master key, or maintenance key — can trigger validation errors to learn the names of required (non-null) custom fields on classes it already references by name, partially defeating the schema-hiding intent of disabling public introspection. No stored data, credentials, optional field names, unreferenced class names, or Cloud Code function names are exposed.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| parse-community | parse-server | 9.0.0 – before 9.10.0-alpha.5 |
| parse-community | parse-server | 8.2.2 – before 8.6.86 |
Weakness: CWE-209 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
References
- GitHub Security Advisory (GHSA-2fgh-8j2g-w354) vendor-advisory
- VulnCheck Advisory: Parse Server 9.0.0 Information Disclosure via GraphQL Error Messages third-party-advisory