Vulnerability Description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.80 and 9.9.1-alpha.6, a relation query using the $relatedTo operator could read the membership of a Relation field even when that field was hidden from the requesting client by protectedFields, and even when the object owning the relation was not readable by the client under its ACL or class-level permissions. The request requires only the public API credentials that Parse clients normally carry — no user session, master key, or Cloud Code is needed. As a result, an unauthenticated client who knows or obtains the owning object's objectId could enumerate the objects linked through a protected relation, or combine the operator with an objectId constraint to use it as a membership oracle — confirming whether a specific object is linked to a private parent. This affects applications that rely on protectedFields or object ACLs to keep Relation membership confidential, such as private group memberships, block lists, or account-to-resource associations. This issue has been patched in versions 8.6.80 and 9.9.1-alpha.6.
Related Weaknesses (CWE)
References
- https://github.com/parse-community/parse-server/pull/10493
- https://github.com/parse-community/parse-server/pull/10494
- https://github.com/parse-community/parse-server/security/advisories/GHSA-wmwx-jr
FAQ
What is CVE-2026-53726?
CVE-2026-53726 is a documented vulnerability. Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.80 and 9.9.1-alpha.6, a relation query using the $relatedTo operator could...
How severe is CVE-2026-53726?
CVSS scoring is not yet available for CVE-2026-53726. Check NVD for updates.
Is there a patch for CVE-2026-53726?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.