CVE-2026-34224: Parse server Parse Server Has An MFA Vulnerability

LOW
Advisory Identifier: GHSA-w73w-g5xw-rwhf
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CWE-367
Published
Advisory Summary

CVE-2026-34224 is a LOW parse server has an mfa vulnerability (CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition) affecting Parse server libraries in the npm ecosystem. The issue involves parse server has an mfa single-use token bypass via concurrent authdata login requests. Remediation is available by upgrading affected packages to version 9.7.0-alpha.8, 8.6.64.

CVE-2026-34224 at a Glance

CVE Identifier CVE-2026-34224
GHSA Identifier GHSA-w73w-g5xw-rwhf
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
Affected Product Parse server
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-34224

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.8 
npm install parse-server@9.7.0-alpha.8
parse-server fixed: 8.6.64 
npm install parse-server@8.6.64
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-2026-34224, 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.8), 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-367: Time-of-check Time-of-use (TOCTOU) Race Condition, where the product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. 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 An attacker who possesses a valid authentication provider token and a single MFA recovery code or SMS one-time password can create multiple authenticated sessions by sending concurrent login requests via the authData login endpoint. This defeats the single-use guarantee of MFA recovery codes and SMS one-time passwords, allowing session persistence even after the legitimate user revokes detected sessions. ### Patches The fix adds optimistic locking to the authData login path, ensuring that concurrent database updates for the same user fail when the original MFA token array has already been modified by another request. ### Workarounds There is no known workaround.

CVE-2026-34224 Affected Parse server Versions

2 component(s)
Fixed Versions:
9.7.0-alpha.88.6.64
Product / Package Ecosystem Affected Versions Fixed Version
parse-server
npm/parse-server
npm
≥ 9.0.0
< 9.7.0-alpha.8
9.7.0-alpha.8
parse-server
npm/parse-server
npm
< 8.6.64
8.6.64

References

GitHub Advisory / Wiki ADVISORY
https://github.com/parse-community/parse-server/security/advisories/GHSA-w73w-g5xw-rwhf
NVD — CVE-2026-34224 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34224
Parse server Source Repository REPOSITORY
https://github.com/parse-community/parse-server/pull/10326
Parse server Source Repository REPOSITORY
https://github.com/parse-community/parse-server/pull/10327
Security Fix Commit FIX COMMIT
https://github.com/parse-community/parse-server/commit/661f160edac8daac0486bc94413cf9652876ab92
Security Fix Commit FIX COMMIT
https://github.com/parse-community/parse-server/commit/e7efbebba398ce6abe5b6b6fb9829c6ebe310fbf
Parse server Source Repository REPOSITORY
https://github.com/parse-community/parse-server

Frequently Asked Questions

What is CVE-2026-34224?
CVE-2026-34224 is a security vulnerability in Parse server involving Parse Server has an MFA single-use token bypass via concurrent authData login requests under CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition.
Which Parse server versions are affected?
Affected versions include releases prior to 9.7.0-alpha.8, 8.6.64 across affected packages: parse-server.
What version fixes CVE-2026-34224?
Upgrading to 9.7.0-alpha.8, 8.6.64 (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.8, 8.6.64. Upgrade your dependency to 9.7.0-alpha.8, 8.6.64 or later.
What CWE is associated with CVE-2026-34224?
CVE-2026-34224 is classified under CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition (The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.).
How can I check npm dependencies for CVE-2026-34224?
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-w73w-g5xw-rwhf",
  "modified" : "2026-03-31T18:51:40Z",
  "published" : "2026-03-29T15:23:03Z",
  "aliases" : [ "CVE-2026-34224" ],
  "summary" : "Parse Server has an MFA single-use token bypass via concurrent authData login requests",
  "details" : "### Impact\n\nAn attacker who possesses a valid authentication provider token and a single MFA recovery code or SMS one-time password can create multiple authenticated sessions by sending concurrent login requests via the authData login endpoint. This defeats the single-use guarantee of MFA recovery codes and SMS one-time passwords, allowing session persistence even after the legitimate user revokes detected sessions.\n\n### Patches\n\nThe fix adds optimistic locking to the authData login path, ensuring that concurrent database updates for the same user fail when the original MFA token array has already been modified by another request.\n\n### Workarounds\n\nThere is no known workaround.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "parse-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.0.0"
      }, {
        "fixed" : "9.7.0-alpha.8"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
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    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "8.6.64"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/security/advisories/GHSA-w73w-g5xw-rwhf"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34224"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/pull/10326"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/pull/10327"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/commit/661f160edac8daac0486bc94413cf9652876ab92"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/commit/e7efbebba398ce6abe5b6b6fb9829c6ebe310fbf"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/parse-community/parse-server"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-367" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-29T15:23:03Z",
    "nvd_published_at" : "2026-03-31T15:16:18Z"
  }
}