---
id: "CVE-2026-116801"
kind: "vulnerability"
aliases: ["CVE-2026-116801"]
title: "Parse Server: relation queries skip owner ACL check, leaking linked object IDs"
severity: "medium"
cvss: 5.3
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["backend-as-a-service", "node.js", "package", "parse-server", "self-hosted"]
not_affected_if: ["patched-version"]
published_at: "2026-10-27T00:17:11+00:00"
first_seen_at: "2026-10-27T00:25:55+00:00"
updated_at: "2026-10-27T00:26:44+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116801", "first_seen_at": "2026-10-27T00:25:55+00:00"}]
---

# Parse Server: relation queries skip owner ACL check, leaking linked object IDs

Parse Server does not validate the owning object ID in $relatedTo relation queries, so passing a query operator in place of an ID bypasses the owner's ACL check. A client with read access to one object of the owning class can learn which readable objects link to owners it cannot read.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Parse Server version with `npm ls parse-server` and compare it to `8.6.105` (8.x line) or `9.10.5-alpha.6` (9.x line)
- unknown whether the sources list other check steps

## Fix

- Upgrade parse-server to `8.6.105` or later on the 8.x line, or to `9.10.5-alpha.6` or later on the 9.x line
- unknown whether a configuration workaround exists

## Timeline

- 2026-10-27T00:25:55+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116801

## From the sources

Parse Server before 8.6.105 and 9.0.0 before 9.10.5-alpha.6 does not validate the owning object reference in $relatedTo relation queries, so supplying a query operator instead of an object ID bypasses the owning-object ACL check. A client with read access to at least one object of the owning class can disclose which readable objects are linked to owning objects it cannot read.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_