CVE-2026-32742
Received Received - Intake
Session Field Overwrite in Parse Server Enables Session Expiration Bypass

Publication date: 2026-03-18

Last updated on: 2026-03-19

Assigner: GitHub, Inc.

Description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.17 and 8.6.42, 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. Starting in version 9.6.0-alpha.17 and 8.6.42, the session creation endpoint filters out server-generated fields from user-supplied data, preventing them from being overwritten. As a workaround, add a `beforeSave` trigger on the `_Session` class to validate and reject or strip any user-supplied values for `sessionToken`, `expiresAt`, and `createdWith`.
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Meta Information
Published
2026-03-18
Last Modified
2026-03-19
Generated
2026-06-16
AI Q&A
2026-03-19
EPSS Evaluated
2026-06-15
NVD
CVE-2026-32742
Affected Vendors & Products
Showing 17 associated CPEs
Vendor Product Version / Range
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server From 9.0.0 (inc) to 9.6.0 (exc)
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server 9.6.0
parseplatform parse-server to 8.6.42 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-915 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.
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Executive Summary

This vulnerability affects Parse Server versions prior to 9.6.0-alpha.17 and 8.6.42. An authenticated user can overwrite server-generated session fields such as sessionToken, expiresAt, and createdWith when creating a session object via the POST /classes/_Session endpoint.

By overwriting these fields, the user can bypass the server's session expiration policy by setting an arbitrary far-future expiration date and can also set a predictable session token value.

Starting from versions 9.6.0-alpha.17 and 8.6.42, the server filters out these server-generated fields from user-supplied data to prevent overwriting. A workaround for vulnerable versions is to add a beforeSave trigger on the _Session class to validate and reject or strip any user-supplied values for these fields.

Impact Analysis

This vulnerability allows an authenticated user to bypass session expiration controls by setting a session to expire at a far-future date, effectively extending their session indefinitely.

It also allows the user to set predictable session token values, which can increase the risk of session hijacking or unauthorized access.

Overall, this can lead to unauthorized prolonged access to the system without re-authentication, potentially compromising the security of the application.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, upgrade Parse Server to version 9.6.0-alpha.17 or 8.6.42 or later, where the session creation endpoint filters out server-generated fields from user-supplied data, preventing overwriting.

As a workaround if upgrading is not immediately possible, add a beforeSave trigger on the _Session class to validate and reject or strip any user-supplied values for sessionToken, expiresAt, and createdWith.

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