Skip to content
Heist/ feed
Back to feed
High

Parse Server leaks protected fields via LiveQuery afterEvent trigger

Type: advisorySources: OSV

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.35 and 8.6.50, when a `Parse.Cloud.afterLiveQueryEvent` trigger is registered for a class, the LiveQuery server leaks protected fields and `authData` to all subscribers of that class. Fields configured as protected via Class-Level Permissions (`protectedFields`) are included in LiveQuery event payloads for all event types (create, update, delete, enter, leave). Any user with sufficient CLP permissions to subscribe to the affected class can receive protected field data of other users, including sensitive personal information and OAuth tokens from third-party authentication providers. The vulnerability was caused by a reference detachment bug. When an `afterEvent` trigger is registered, the LiveQuery server converts the event object to a `Parse.Object` for the trigger, then creates a new JSON copy via `toJSONwithObjects()`. The sensitive data filter was applied to the `Parse.Object` reference, but the unfiltered JSON copy was sent to clients. The fix in versions 9.6.0-alpha.35 and 8.6.50 ensures that the JSON copy is assigned back to the response object before filtering, so the filter operates on the actual data sent to clients. As a workaround, remove all `Parse.Cloud.afterLiveQueryEvent` trigger registrations. Without an `afterEvent` trigger, the reference detachment does not occur and protected fields are correctly filtered.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-33163
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 12:56 UTC · Revision 1

Source evidence

Parse Server leaks protected fields via LiveQuery afterEvent trigger

core-osv · Original source

Published 18 Mar 2026, 21:58 UTC

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.35 and 8.6.50, when a `Parse.Cloud.afterLiveQueryEvent` trigger is registered for a class, the LiveQuery server leaks protected fields and `authData` to all subscribers of that class. Fields configured as protected via Class-Level Permissions (`protectedFields`) are included in LiveQuery event payloads for all event types (create, update, delete, enter, leave). Any user with sufficient CLP permissions to subscribe to the affected class can receive protected field data of other users, including sensitive personal information and OAuth tokens from third-party authentication providers. The vulnerability was caused by a reference detachment bug. When an `afterEvent` trigger is registered, the LiveQuery server converts the event object to a `Parse.Object` for the trigger, then creates a new JSON copy via `toJSONwithObjects()`. The sensitive data filter was applied to the `Parse.Object` reference, but the unfiltered JSON copy was sent to clients. The fix in versions 9.6.0-alpha.35 and 8.6.50 ensures that the JSON copy is assigned back to the response object before filtering, so the filter operates on the actual data sent to clients. As a workaround, remove all `Parse.Cloud.afterLiveQueryEvent` trigger registrations. Without an `afterEvent` trigger, the reference detachment does not occur and protected fields are correctly filtered.

osv:CVE-2026-33163
Complete source record
{
  "id": "d93d415e1abd45e0affb8b9a195295b6055fa72afe442e9761dab4067e1c27e6",
  "url": "https://osv.dev/vulnerability/CVE-2026-33163",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Parse Server leaks protected fields via LiveQuery afterEvent trigger",
    "summary": "Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.35 and 8.6.50, when a `Parse.Cloud.afterLiveQueryEvent` trigger is registered for a class, the LiveQuery server leaks protected fields and `authData` to all subscribers of that class. Fields configured as protected via Class-Level Permissions (`protectedFields`) are included in LiveQuery event payloads for all event types (create, update, delete, enter, leave). Any user with sufficient CLP permissions to subscribe to the affected class can receive protected field data of other users, including sensitive personal information and OAuth tokens from third-party authentication providers. The vulnerability was caused by a reference detachment bug. When an `afterEvent` trigger is registered, the LiveQuery server converts the event object to a `Parse.Object` for the trigger, then creates a new JSON copy via `toJSONwithObjects()`. The sensitive data filter was applied to the `Parse.Object` reference, but the unfiltered JSON copy was sent to clients. The fix in versions 9.6.0-alpha.35 and 8.6.50 ensures that the JSON copy is assigned back to the response object before filtering, so the filter operates on the actual data sent to clients. As a workaround, remove all `Parse.Cloud.afterLiveQueryEvent` trigger registrations. Without an `afterEvent` trigger, the reference detachment does not occur and protected fields are correctly filtered.",
    "evidence": "osv:CVE-2026-33163",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-33163",
      "aliases": [
        "BIT-parse-2026-33163",
        "CVE-2026-33163",
        "GHSA-5hmj-jcgp-6hff"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/parse-community/parse-server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "665216d6dcb3397a01657c07a9cb8e96cfa3bbad"
                },
                {
                  "introduced": "532a461d30a6ed4457839f2caf5f30d5abf51a55"
                },
                {
                  "fixed": "cb062a6bca0827265804fd6ad60a55f1a360c15e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "8.6.50"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "9.0.0"
                      },
                      {
                        "fixed": "9.6.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "9.5.1",
            "8.6.49",
            "8.6.48",
            "8.6.47",
            "8.6.46",
            "8.6.45",
            "8.6.44",
            "8.6.43",
            "8.6.42",
            "8.6.41",
            "8.6.40",
            "8.6.39",
            "8.6.38",
            "8.6.37",
            "8.6.36",
            "8.6.35",
            "8.6.34",
            "8.6.33",
            "8.6.32",
            "8.6.31",
            "8.6.30",
            "8.6.29",
            "8.6.28",
            "8.6.27",
            "8.6.26",
            "8.6.25",
            "8.6.24",
            "8.6.23",
            "8.6.22",
            "8.6.21",
            "8.6.20",
            "8.6.19",
            "8.6.18",
            "8.6.17",
            "8.6.16",
            "8.6.15",
            "8.6.14",
            "8.6.13",
            "9.5.0",
            "8.6.12",
            "8.6.11",
            "9.4.1",
            "8.6.10",
            "8.6.9",
            "8.6.8",
            "8.6.7",
            "8.6.6",
            "8.6.5",
            "8.6.4",
            "9.4.0",
            "8.6.3",
            "9.3.1",
            "9.3.0",
            "8.6.2",
            "9.2.0",
            "9.1.1",
            "9.1.0",
            "8.6.1",
            "9.0.0",
            "8.6.0",
            "8.5.0",
            "8.4.0",
            "8.3.0",
            "8.2.5",
            "8.2.4",
            "8.2.3",
            "8.2.2",
            "8.2.1",
            "8.2.0",
            "8.1.0",
            "8.0.2",
            "8.0.1",
            "8.0.0",
            "7.4.0",
            "7.3.0",
            "7.2.0",
            "7.1.0",
            "7.0.0",
            "6.4.0",
            "6.3.1",
            "6.3.0",
            "6.2.2",
            "6.2.1",
            "6.2.0",
            "6.1.0",
            "6.0.0",
            "5.4.0",
            "5.3.3",
            "5.3.2",
            "5.3.1",
            "5.3.0",
            "5.2.8",
            "5.2.7",
            "5.2.6",
            "5.2.5",
            "5.2.4",
            "5.2.3",
            "5.2.2",
            "5.2.1",
            "5.2.0",
            "5.1.1",
            "5.1.0",
            "5.0.0",
            "5.0.0-alpha.1",
            "4.5.0",
            "4.4.0",
            "4.3.0",
            "4.2.0",
            "4.1.0",
            "4.0.2",
            "4.0.1",
            "4.0.0",
            "3.10.0",
            "3.9.0",
            "3.8.0",
            "3.7.2",
            "3.7.1",
            "3.7.0",
            "3.6.0",
            "3.5.0",
            "3.4.0",
            "3.4.1",
            "3.3.0",
            "3.2.3",
            "3.2.2",
            "3.2.1",
            "3.2.0",
            "3.1.3",
            "3.1.2",
            "3.1.1",
            "3.1.0",
            "3.0.0",
            "2.8.2",
            "2.8.0",
            "2.7.4",
            "2.7.3",
            "2.7.2",
            "2.7.1",
            "2.7.0",
            "2.6.5",
            "2.6.4",
            "2.6.3",
            "2.6.2",
            "2.6.1",
            "2.6.0",
            "2.5.3",
            "2.5.2",
            "2.5.1",
            "2.5.0",
            "2.4.2",
            "2.4.1",
            "2.4.0",
            "2.3.8",
            "2.3.7",
            "2.3.6",
            "2.3.5",
            "2.3.4",
            "2.3.3",
            "2.3.2",
            "2.3.1",
            "2.2.25",
            "2.2.25-beta.1",
            "2.2.24",
            "2.2.23",
            "2.2.22",
            "2.2.21",
            "2.2.20",
            "2.2.19",
            "2.2.18",
            "2.2.17",
            "2.2.16",
            "2.2.15",
            "2.2.14",
            "2.2.13",
            "2.2.12",
            "2.2.11",
            "2.2.10",
            "2.2.9",
            "2.2.8",
            "2.2.7",
            "2.2.6",
            "2.2.5",
            "2.2.4",
            "2.2.3",
            "2.2.2",
            "2.2.1",
            "2.2.0",
            "2.1.6",
            "2.1.5",
            "2.1.4",
            "2.1.3",
            "2.1.2",
            "2.1.1",
            "2.1.0",
            "2.0.8",
            "2.0.7",
            "2.0.3",
            "2.0.6",
            "2.0.5",
            "2.0.4",
            "2.0.2",
            "2.0.1",
            "2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33163.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.803750715Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33163.json",
        "https://github.com/parse-community/parse-server/security/advisories/GHSA-5hmj-jcgp-6hff",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-33163",
        "https://github.com/parse-community/parse-server/pull/10232",
        "https://github.com/parse-community/parse-server/pull/10233"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-200"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33163.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-33163",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 495599,
  "published_at": "2026-03-18T21:58:04.293+00:00"
}