CVE-2026-64627 Parse Server 9.0.0 Schema Disclosure via GraphQL Variable Coercion

What is CVE-2026-64627?

CVE-2026-64627 is a medium-severity vulnerability in parse-community parse-server, published on 21 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-209

Which versions are affected by CVE-2026-64627?

1 open source package ship an affected version, including parse.

How do I fix CVE-2026-64627?

Upgrade parse to a fixed version for your release line: 8.6.85 or 9.10.0.

Is CVE-2026-64627 being exploited?

There is no known exploitation of CVE-2026-64627 in the wild and no public exploit code.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as BIT-parse-2026-64627, GHSA-9g8f-h8f3-hjcm, GHSA-rjjh-vx7v-m7mf.