Unauthenticated function invocation via prototype chain traversal
Published Mar 31, 2026 · Updated Mar 31, 2026
Incorrect authorization in Parse Server before 8.6.67 and 9.0.0 through 9.7.0-alpha.10 allows remote attackers to invoke protected Cloud Functions. The trigger store traverses a function-keyword handler's prototype chain, but the validator store does not mirror that path, so a URL suffix of prototype.constructor skips validator enforcement. Exposure requires a protected Cloud Function declared with the function keyword and a plain-object or arrow-function validator; unauthenticated invocation can read or alter whatever that function exposes.
Summary
What happened
Incorrect authorization in Parse Server before 8.6.67 and 9.0.0 through 9.7.0-alpha.10 allows remote attackers to invoke protected Cloud Functions. The trigger store traverses a function-keyword handler's prototype chain, but the validator store does not mirror that path, so a URL suffix of prototype.constructor skips validator enforcement. Exposure requires a protected Cloud Function declared with the function keyword and a plain-object or arrow-function validator; unauthenticated invocation can read or alter whatever that function exposes.
The record
- CVE
- CVE-2026-34532
- Published
- Mar 31, 2026
- Updated
- Mar 31, 2026
- Vendor
- Parse Platform
- Product
- Parse Server
- Classifications
- CWE-863, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 31, 2026CVE publishedPublication date reported by the CVE source.
- Mar 31, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 8.6.67
- Affected versionversion=>= 9.0.0, < 9.7.0-alpha.11
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
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- Parse Server prototype.constructor regression testproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo