CVE-2026-64627: Parse Server 9.0.0 Schema Disclosure via GraphQL Variable Coercion
Parse Server versions >= 9.0.0 before 9.10.0-alpha.4 and versions before 8.6.85 contain a schema disclosure vulnerability. When the GraphQL API is mounted with public introspection disabled (graphQLPublicIntrospection: false, the default), schema-derived 'Did you mean ...?' suggestions were still returned in GraphQL error messages produced during variable coercion, which were not covered by the introspection-hardening control (that only handled validation errors). An unauthenticated caller possessing only the public application id can iteratively recover hidden schema identifiers — including registered Cloud Code function names and Parse class and field names — by submitting queries or mutations whose variables contain near-miss enum values or input-object field names. This is a follow-up bypass of GHSA-8cph-rgr4-g5vj. The issue is fixed in 9.10.0-alpha.4 and 8.6.85.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Parse Serverto a version that resolves this vulnerability.Fixed in 9.10.0-alpha.4 - Upgrade
Upgrade
Parse Serverto a version that resolves this vulnerability.Fixed in 8.6.85
Event History
Frequently Asked Questions
What is the severity of CVE-2026-64627?
CVE-2026-64627 has a medium severity rating of 6.9 on the CVSS scale.
How do I fix CVE-2026-64627?
To mitigate CVE-2026-64627, upgrade Parse Server to version 9.10.0-alpha.4 or later, or version 8.6.85 or later.
What systems are affected by CVE-2026-64627?
CVE-2026-64627 affects Parse Server versions 9.0.0 through 9.10.0-alpha.4 and versions prior to 8.6.85.
What is the nature of the vulnerability in CVE-2026-64627?
CVE-2026-64627 is a schema disclosure vulnerability that can lead to unintended exposure of schema-derived information through GraphQL.
When was CVE-2026-64627 published?
CVE-2026-64627 was published on July 21, 2026.