CVE-2026-32742: Parse server Parse Server Session Creation Endpoint Vulnerability

MODERATE
Advisory Identifier: GHSA-5v7g-9h8f-8pgg
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CVSS 4.3
CWE-915
Published
Advisory Summary

CVE-2026-32742 is a MODERATE (CVSS 4.3) parse server session creation endpoint vulnerability (CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes) affecting Parse server libraries in the npm ecosystem. The issue involves parse server session creation endpoint allows overwriting server-generated session fields. Remediation is available by upgrading affected packages to version 9.6.0-alpha.17, 8.6.42.

CVE-2026-32742 at a Glance

CVE Identifier CVE-2026-32742
GHSA Identifier GHSA-5v7g-9h8f-8pgg
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes
Affected Product Parse server
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 4.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-32742

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.17 
npm install parse-server@9.6.0-alpha.17
parse-server fixed: 8.6.42 
npm install parse-server@8.6.42
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-2026-32742, 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.17), 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-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes, where the product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified. 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 can overwrite server-generated session fields (`sessionToken`, `expiresAt`, `createdWith`) when creating a session object via `POST /classes/_Session`. This allows bypassing the server's session expiration policy by setting an arbitrary far-future expiration date. It also allows setting a predictable session token value. ### Patches The session creation endpoint now filters out server-generated fields from user-supplied data, preventing them from being overwritten. ### Workarounds Add a `beforeSave` trigger on the `_Session` class to validate and reject or strip any user-supplied values for `sessionToken`, `expiresAt`, and `createdWith`.

CVE-2026-32742 Affected Parse server Versions

2 component(s)
Fixed Versions:
9.6.0-alpha.178.6.42
Product / Package Ecosystem Affected Versions Fixed Version
parse-server
npm/parse-server
npm
≥ 9.0.0
< 9.6.0-alpha.17
9.6.0-alpha.17
parse-server
npm/parse-server
npm
< 8.6.42
8.6.42

References

GitHub Advisory / Wiki ADVISORY
https://github.com/parse-community/parse-server/security/advisories/GHSA-5v7g-9h8f-8pgg
NVD — CVE-2026-32742 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-32742
Parse server Source Repository REPOSITORY
https://github.com/parse-community/parse-server/pull/10195
Parse server Source Repository REPOSITORY
https://github.com/parse-community/parse-server/pull/10196
Parse server Source Repository REPOSITORY
https://github.com/parse-community/parse-server

Frequently Asked Questions

What is CVE-2026-32742?
CVE-2026-32742 is a security vulnerability in Parse server involving Parse Server session creation endpoint allows overwriting server-generated session fields under CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes.
Which Parse server versions are affected?
Affected versions include releases prior to 9.6.0-alpha.17, 8.6.42 across affected packages: parse-server.
What version fixes CVE-2026-32742?
Upgrading to 9.6.0-alpha.17, 8.6.42 (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.17, 8.6.42. Upgrade your dependency to 9.6.0-alpha.17, 8.6.42 or later.
What is the CVSS score of CVE-2026-32742?
CVE-2026-32742 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2026-32742?
CVE-2026-32742 is classified under CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes (The product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified.).
How can I check npm dependencies for CVE-2026-32742?
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-5v7g-9h8f-8pgg",
  "modified" : "2026-03-19T21:13:13Z",
  "published" : "2026-03-17T18:37:23Z",
  "aliases" : [ "CVE-2026-32742" ],
  "summary" : "Parse Server session creation endpoint allows overwriting server-generated session fields",
  "details" : "### Impact\n\nAn authenticated user can overwrite server-generated session fields (`sessionToken`, `expiresAt`, `createdWith`) when creating a session object via `POST /classes/_Session`. This allows bypassing the server's session expiration policy by setting an arbitrary far-future expiration date. It also allows setting a predictable session token value.\n\n### Patches\n\nThe session creation endpoint now filters out server-generated fields from user-supplied data, preventing them from being overwritten.\n\n### Workarounds\n\nAdd a `beforeSave` trigger on the `_Session` class to validate and reject or strip any user-supplied values for `sessionToken`, `expiresAt`, and `createdWith`.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "parse-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.0.0"
      }, {
        "fixed" : "9.6.0-alpha.17"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "parse-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "8.6.42"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/security/advisories/GHSA-5v7g-9h8f-8pgg"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-32742"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/pull/10195"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/parse-community/parse-server/pull/10196"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/parse-community/parse-server"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-915" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-17T18:37:23Z",
    "nvd_published_at" : "2026-03-18T22:16:25Z"
  }
}