CVE-2026-33627: Parse server Parse Server Exposes Auth Data Vulnerability

HIGH
Advisory Identifier: GHSA-37mj-c2wf-cx96
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CWE-200
Published
Advisory Summary

CVE-2026-33627 is a HIGH parse server exposes auth data vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Parse server libraries in the npm ecosystem. The issue involves parse server exposes auth data via /users/me endpoint. Remediation is available by upgrading affected packages to version 9.6.0-alpha.55, 8.6.61.

CVE-2026-33627 at a Glance

CVE Identifier CVE-2026-33627
GHSA Identifier GHSA-37mj-c2wf-cx96
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-2026-33627

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.55 
npm install parse-server@9.6.0-alpha.55
parse-server fixed: 8.6.61 
npm install parse-server@8.6.61
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-2026-33627, 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.55), 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 An authenticated user calling `GET /users/me` receives unsanitized auth data, including sensitive credentials such as MFA TOTP secrets and recovery codes. The endpoint internally uses master-level authentication for the session query, and the master context leaks through to the user data, bypassing auth adapter sanitization. An attacker who obtains a user's session token can extract MFA secrets to generate valid TOTP codes indefinitely. ### Patches The `/users/me` endpoint now queries the session and user data separately, using the caller's authentication context for the user query so that all security layers apply correctly. ### Workarounds There is no known workaround.

CVE-2026-33627 Affected Parse server Versions

2 component(s)
Fixed Versions:
9.6.0-alpha.558.6.61
Product / Package Ecosystem Affected Versions Fixed Version
parse-server
npm/parse-server
npm
≥ 9.0.0
< 9.6.0-alpha.55
9.6.0-alpha.55
parse-server
npm/parse-server
npm
< 8.6.61
8.6.61

References

GitHub Advisory / Wiki ADVISORY
https://github.com/parse-community/parse-server/security/advisories/GHSA-37mj-c2wf-cx96
NVD — CVE-2026-33627 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33627
Parse server Source Repository REPOSITORY
https://github.com/parse-community/parse-server/pull/10278
Parse server Source Repository REPOSITORY
https://github.com/parse-community/parse-server/pull/10279
Security Fix Commit FIX COMMIT
https://github.com/parse-community/parse-server/commit/5b8998e6866bcf75be7b5bb625e27d23bfaf912c
Security Fix Commit FIX COMMIT
https://github.com/parse-community/parse-server/commit/875cf10ac979bd60f70e7a0c534e2bc194d6982f
Parse server Source Repository REPOSITORY
https://github.com/parse-community/parse-server

Frequently Asked Questions

What is CVE-2026-33627?
CVE-2026-33627 is a security vulnerability in Parse server involving Parse Server exposes auth data via /users/me endpoint 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.55, 8.6.61 across affected packages: parse-server.
What version fixes CVE-2026-33627?
Upgrading to 9.6.0-alpha.55, 8.6.61 (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.55, 8.6.61. Upgrade your dependency to 9.6.0-alpha.55, 8.6.61 or later.
What CWE is associated with CVE-2026-33627?
CVE-2026-33627 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-2026-33627?
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-37mj-c2wf-cx96",
  "modified" : "2026-03-27T21:55:02Z",
  "published" : "2026-03-24T20:17:02Z",
  "aliases" : [ "CVE-2026-33627" ],
  "summary" : "Parse Server exposes auth data via /users/me endpoint",
  "details" : "### Impact\n\nAn authenticated user calling `GET /users/me` receives unsanitized auth data, including sensitive credentials such as MFA TOTP secrets and recovery codes. The endpoint internally uses master-level authentication for the session query, and the master context leaks through to the user data, bypassing auth adapter sanitization. An attacker who obtains a user's session token can extract MFA secrets to generate valid TOTP codes indefinitely.\n\n### Patches\n\nThe `/users/me` endpoint now queries the session and user data separately, using the caller's authentication context for the user query so that all security layers apply correctly.\n\n### Workarounds\n\nThere is no known workaround.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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.55"
      } ]
    } ]
  }, {
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      "ecosystem" : "npm",
      "name" : "parse-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
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        "fixed" : "8.6.61"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/security/advisories/GHSA-37mj-c2wf-cx96"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33627"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/pull/10278"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/pull/10279"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/commit/5b8998e6866bcf75be7b5bb625e27d23bfaf912c"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/commit/875cf10ac979bd60f70e7a0c534e2bc194d6982f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/parse-community/parse-server"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-24T20:17:02Z",
    "nvd_published_at" : "2026-03-24T19:16:55Z"
  }
}