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CVE-2026-64627

Parse Server 9.0.0 Schema Disclosure via GraphQL Variable Coercion

MEDIUM
6.9
CVSS Score
Published: July 21, 2026 at 11:39 AM UTC
Updated: October 24, 2026 at 08:10 PM UTC
2 products affected across 2 vendorsParse ServerParse Server

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Severity
MEDIUM6.9
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Parse Server· Parseplatformnpm
95%
v < 8.6.859.0.0 ≤ v < 9.10.0-alpha.4
Affected range stops below 8.6.85, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.10.0-alpha.4, so it looks safe — our inference, not a vendor statement
Parse Server· Parse Communitynpm
90%
0 ≤ v < 8.6.859.0.0 ≤ v < 9.10.0-alpha.409.0.0
Vendor states this is fixed in 8.6.85 (unaffected)
Vendor states this is fixed in 9.10.0-alpha.4 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://github.com/parse-community/parse-server/security/advisories/GHSA-9g8f-h8f3-hjcm
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/parse-server-schema-disclosure-via-graphql-variable-coercion

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.9MEDIUMVulnCheck
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-209

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