CVE-2026-34373: Parse server GraphQL API Endpoint Ignores CORS Vulnerability

Q: What is CVE-2026-34373?

CVE-2026-34373 is a security vulnerability in Parse server involving GraphQL API endpoint ignores CORS origin restriction under CWE-346: Origin Validation Error.

Q: Which Parse server versions are affected?

Affected versions include releases prior to 9.7.0-alpha.10, 8.6.66 across affected packages: parse-server.

Q: What version fixes CVE-2026-34373?

Upgrading to 9.7.0-alpha.10, 8.6.66 (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is parse-server affected?

Yes, parse-server is affected in releases prior to 9.7.0-alpha.10, 8.6.66. Upgrade your dependency to 9.7.0-alpha.10, 8.6.66 or later.

Q: What CWE is associated with CVE-2026-34373?

CVE-2026-34373 is classified under CWE-346: Origin Validation Error (The product does not properly verify that the source of data or communication is valid.).

Q: How can I check npm dependencies for CVE-2026-34373?

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.

MODERATE

Advisory Identifier: GHSA-q3p6-g7c4-829c

CWE-346

Published 2026-03-30

Advisory Summary

CVE-2026-34373 is a MODERATE graphql api endpoint ignores cors vulnerability (CWE-346: Origin Validation Error) affecting Parse server libraries in the npm ecosystem. The issue involves graphql api endpoint ignores cors origin restriction. Remediation is available by upgrading affected packages to version 9.7.0-alpha.10, 8.6.66.

CVE-2026-34373 at a Glance

CVE Identifier CVE-2026-34373

GHSA Identifier GHSA-q3p6-g7c4-829c

Severity MODERATE

CVSS v3.1 Base Score N/A

CWE Classification CWE-346: Origin Validation Error

Affected Product Parse server

Package Ecosystem npm

Published Date 2026-03-30

Last Updated 2026-03-31

How to Fix CVE-2026-34373

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: 9.7.0-alpha.10

npm install parse-server@9.7.0-alpha.10

parse-server fixed: 8.6.66

npm install parse-server@8.6.66

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-2026-34373, 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 9.7.0-alpha.10), 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-346: Origin Validation Error, where the product does not properly verify that the source of data or communication is valid. 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 The GraphQL API endpoint does not respect the `allowOrigin` server option and unconditionally allows cross-origin requests from any website. This bypasses origin restrictions that operators configure to control which websites can interact with the Parse Server API. The REST API correctly enforces the configured `allowOrigin` restriction. ### Patches The GraphQL API endpoint now uses the same CORS middleware as the REST API, ensuring the `allowOrigin` and `allowHeaders` server options are consistently enforced across all endpoints. ### Workarounds There is no known workaround other than upgrading. ### Resources - GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-q3p6-g7c4-829c - Fix Parse Server 9: https://github.com/parse-community/parse-server/pull/10334 - Fix Parse Server 8: https://github.com/parse-community/parse-server/pull/10335

CVE-2026-34373 Affected Parse server Versions

2 component(s)

Fixed Versions:

9.7.0-alpha.108.6.66

Product / Package	Ecosystem	Affected Versions	Fixed Version
parse-server npm/parse-server	npm	≥ 9.0.0 < 9.7.0-alpha.10	9.7.0-alpha.10
parse-server npm/parse-server	npm	≥ 3.5.0 < 8.6.66	8.6.66

References

GitHub Advisory / Wiki ADVISORY

https://github.com/parse-community/parse-server/security/advisories/GHSA-q3p6-g7c4-829c

NVD — CVE-2026-34373 NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-34373

Parse server Source Repository REPOSITORY

https://github.com/parse-community/parse-server/pull/10334

Parse server Source Repository REPOSITORY

https://github.com/parse-community/parse-server/pull/10335

Security Fix Commit FIX COMMIT

https://github.com/parse-community/parse-server/commit/0347641507891d0013ec57f7c10f012064f41263

Security Fix Commit FIX COMMIT

https://github.com/parse-community/parse-server/commit/4dd0d3d8be1c39664c74ad10bb0abaa76bc41203

Parse server Source Repository REPOSITORY

https://github.com/parse-community/parse-server

Frequently Asked Questions

What is CVE-2026-34373?

CVE-2026-34373 is a security vulnerability in Parse server involving GraphQL API endpoint ignores CORS origin restriction under CWE-346: Origin Validation Error.

Which Parse server versions are affected?

Affected versions include releases prior to 9.7.0-alpha.10, 8.6.66 across affected packages: parse-server.

What version fixes CVE-2026-34373?

Upgrading to 9.7.0-alpha.10, 8.6.66 (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 9.7.0-alpha.10, 8.6.66. Upgrade your dependency to 9.7.0-alpha.10, 8.6.66 or later.

What CWE is associated with CVE-2026-34373?

CVE-2026-34373 is classified under CWE-346: Origin Validation Error (The product does not properly verify that the source of data or communication is valid.).

How can I check npm dependencies for CVE-2026-34373?

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-q3p6-g7c4-829c",
  "modified" : "2026-03-31T18:51:58Z",
  "published" : "2026-03-30T18:05:47Z",
  "aliases" : [ "CVE-2026-34373" ],
  "summary" : "GraphQL API endpoint ignores CORS origin restriction",
  "details" : "### Impact\n\nThe GraphQL API endpoint does not respect the `allowOrigin` server option and unconditionally allows cross-origin requests from any website. This bypasses origin restrictions that operators configure to control which websites can interact with the Parse Server API. The REST API correctly enforces the configured `allowOrigin` restriction.\n\n### Patches\n\nThe GraphQL API endpoint now uses the same CORS middleware as the REST API, ensuring the `allowOrigin` and `allowHeaders` server options are consistently enforced across all endpoints.\n\n### Workarounds\n\nThere is no known workaround other than upgrading.\n\n### Resources\n\n- GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-q3p6-g7c4-829c\n- Fix Parse Server 9: https://github.com/parse-community/parse-server/pull/10334\n- Fix Parse Server 8: https://github.com/parse-community/parse-server/pull/10335",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "parse-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.0.0"
      }, {
        "fixed" : "9.7.0-alpha.10"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "parse-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.5.0"
      }, {
        "fixed" : "8.6.66"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/security/advisories/GHSA-q3p6-g7c4-829c"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34373"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/pull/10334"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/pull/10335"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/commit/0347641507891d0013ec57f7c10f012064f41263"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/commit/4dd0d3d8be1c39664c74ad10bb0abaa76bc41203"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/parse-community/parse-server"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-346" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-30T18:05:47Z",
    "nvd_published_at" : "2026-03-31T15:16:19Z"
  }
}

CVSS V4

N/A MODERATE

Attack Vector N/A

Attack Complexity N/A

Privileges Required N/A

User Interaction N/A

Scope N/A

Confidentiality N/A

Integrity N/A

Availability N/A

Vector String

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N

Advisory Metadata

Source ID: GHSA-q3p6-g7c4-829c
Schema Version: 1.4.0
Published: 2026-03-30 18:05
Last Modified: 2026-03-31 18:51
Database Record File: advisories/github-reviewed/2026/03/GHSA-q3p6-g7c4-829c/GHSA-q3p6-g7c4-829c.json