CVE-2026-33163: Parse server Parse Server Leaks Protected Fields Vulnerability

HIGH
Advisory Identifier: GHSA-5hmj-jcgp-6hff
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CWE-200
Published
Advisory Summary

CVE-2026-33163 is a HIGH parse server leaks protected fields vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Parse server libraries in the npm ecosystem. The issue involves parse server leaks protected fields via livequery afterevent trigger. Remediation is available by upgrading affected packages to version 9.6.0-alpha.35, 8.6.50.

CVE-2026-33163 at a Glance

CVE Identifier CVE-2026-33163
GHSA Identifier GHSA-5hmj-jcgp-6hff
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Parse server
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-33163

To remediate this vulnerability, upgrade all affected Parse server dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

parse-server fixed: 9.6.0-alpha.35 
npm install parse-server@9.6.0-alpha.35
parse-server fixed: 8.6.50 
npm install parse-server@8.6.50
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls parse-server

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-33163, inspect your project dependencies using npm:

npm ls parse-server

Analyze the terminal output to locate any version of Parse server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 9.6.0-alpha.35), your application is affected.

Note: The npm ls parse-server command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In Parse server, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact 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. ### Patches 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 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. ### Workarounds Remove all `Parse.Cloud.afterLiveQueryEvent` trigger registrations. Without an `afterEvent` trigger, the reference detachment does not occur and protected fields are correctly filtered.

CVE-2026-33163 Affected Parse server Versions

2 component(s)
Fixed Versions:
9.6.0-alpha.358.6.50
Product / Package Ecosystem Affected Versions Fixed Version
parse-server
npm/parse-server
npm
≥ 9.0.0
< 9.6.0-alpha.35
9.6.0-alpha.35
parse-server
npm/parse-server
npm
< 8.6.50
8.6.50

References

GitHub Advisory / Wiki ADVISORY
https://github.com/parse-community/parse-server/security/advisories/GHSA-5hmj-jcgp-6hff
NVD — CVE-2026-33163 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33163
Parse server Source Repository REPOSITORY
https://github.com/parse-community/parse-server/pull/10232
Parse server Source Repository REPOSITORY
https://github.com/parse-community/parse-server/pull/10233
Parse server Source Repository REPOSITORY
https://github.com/parse-community/parse-server

Frequently Asked Questions

What is CVE-2026-33163?
CVE-2026-33163 is a security vulnerability in Parse server involving Parse Server leaks protected fields via LiveQuery afterEvent trigger under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Parse server versions are affected?
Affected versions include releases prior to 9.6.0-alpha.35, 8.6.50 across affected packages: parse-server.
What version fixes CVE-2026-33163?
Upgrading to 9.6.0-alpha.35, 8.6.50 (or the latest patched release for your respective branch) resolves the vulnerability.
Is parse-server affected?
Yes, parse-server is affected in releases prior to 9.6.0-alpha.35, 8.6.50. Upgrade your dependency to 9.6.0-alpha.35, 8.6.50 or later.
What CWE is associated with CVE-2026-33163?
CVE-2026-33163 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check npm dependencies for CVE-2026-33163?
Run the dependency tree command: 'npm ls parse-server'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5hmj-jcgp-6hff",
  "modified" : "2026-03-19T21:16:04Z",
  "published" : "2026-03-18T19:49:27Z",
  "aliases" : [ "CVE-2026-33163" ],
  "summary" : "Parse Server leaks protected fields via LiveQuery afterEvent trigger",
  "details" : "### Impact\n\nWhen 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).\n\nAny 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.\n\n### Patches\n\nThe 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 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.\n\n### Workarounds\n\nRemove all `Parse.Cloud.afterLiveQueryEvent` trigger registrations. Without an `afterEvent` trigger, the reference detachment does not occur and protected fields are correctly filtered.",
  "severity" : [ {
    "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" : [ {
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      "name" : "parse-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.0.0"
      }, {
        "fixed" : "9.6.0-alpha.35"
      } ]
    } ]
  }, {
    "package" : {
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    "ranges" : [ {
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        "fixed" : "8.6.50"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/security/advisories/GHSA-5hmj-jcgp-6hff"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33163"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/pull/10232"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/pull/10233"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/parse-community/parse-server"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-18T19:49:27Z",
    "nvd_published_at" : "2026-03-18T22:16:26Z"
  }
}