Vulnerability Description
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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Parseplatform | Parse-Server | < 8.6.67 |
Related Weaknesses (CWE)
References
- https://github.com/parse-community/parse-server/commit/4fc48cf28f22eea200d74d883Patch
- https://github.com/parse-community/parse-server/commit/dc59e272665644083c5b7f686Patch
- https://github.com/parse-community/parse-server/pull/10342Issue TrackingPatch
- https://github.com/parse-community/parse-server/pull/10343Issue TrackingPatch
- https://github.com/parse-community/parse-server/security/advisories/GHSA-vpj2-qqPatchVendor AdvisoryMitigation
FAQ
What is CVE-2026-34532?
CVE-2026-34532 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 acc...
How severe is CVE-2026-34532?
CVE-2026-34532 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-34532?
Check the references section above for vendor advisories and patch information. Affected products include: Parseplatform Parse-Server.