Required field disclosure via unsanitized GraphQL errors
Published Jul 24, 2026 · Updated Jul 24, 2026
Information disclosure in Parse Server 8.2.2 before 8.6.86 and 9.0.0 before 9.10.0-alpha.5 allows remote attackers to learn required field names. ParseGraphQLServer returns variable-coercion and inline-literal validation errors containing required custom field identifiers instead of redacting them for callers denied schema introspection. Exploitation requires the public application id and a known class name, but no session or privileged key; no stored data, credentials, optional fields, unreferenced classes, or Cloud Code function names are exposed.
Summary
What happened
Information disclosure in Parse Server 8.2.2 before 8.6.86 and 9.0.0 before 9.10.0-alpha.5 allows remote attackers to learn required field names. ParseGraphQLServer returns variable-coercion and inline-literal validation errors containing required custom field identifiers instead of redacting them for callers denied schema introspection. Exploitation requires the public application id and a known class name, but no session or privileged key; no stored data, credentials, optional fields, unreferenced classes, or Cloud Code function names are exposed.
The record
- CVE
- CVE-2026-66009
- Published
- Jul 24, 2026
- Updated
- Jul 24, 2026
- Vendor
- Parse Platform
- Product
- Parse Server
- Classifications
- CWE-209
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 24, 2026CVE publishedPublication date reported by the CVE source.
- Jul 24, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=8.2.2 <8.6.86
- Affected versionversion=9.0.0 <9.10.0-alpha.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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