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CVE-2026-34532

CVE-2026-34532 · Parse Server: Cloud function validator bypass via prototype chain traversal

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.67 and 9.7.0-alpha.11, an attacker can bypass Cloud Function validator access controls by appending "prototype.constructor" to the function name in the URL. When a Cloud Function handler is declared using the function keyword and its validator is a plain object or arrow function, the trigger store traversal resolves the handler through its own prototype chain while the validator store fails to mirror this traversal, causing all access control enforcement to be skipped. This allows unauthenticated callers to invoke Cloud Functions that are meant to be protected by validators such as requireUser, requireMaster, or custom validation logic. This issue has been patched in versions 8.6.67 and 9.7.0-alpha.11.

CVSS 9.1 · Critical · EPSS 0.5% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • parse-server

    Versions
    • < 8.6.67: Affected
    • >= 9.0.0, < 9.7.0-alpha.11: Affected

    No fix published

  • parse-server npm

    Affected ranges
    • SEMVER: ≥ 9.0.0, < 9.7.0-alpha.11

    Update to 9.7.0-alpha.11

  • parse-server npm

    Affected ranges
    • SEMVER: < 8.6.67

    Update to 8.6.67

Original sources

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