CVE-2026-32742

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 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 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`.

How to fix CVE-2026-32742

To remediate CVE-2026-32742, upgrade the affected package to a fixed version below.

• —upgrade to 8.6.42 or later
• —upgrade to 9.6.0-alpha.17 or later

Is CVE-2026-32742 being exploited?

Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 8.6.42, >= 9.0.0, < 9.6.0
• >= 9.0.0, < 9.6.0-alpha.17

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-32742
• PATCHgithub.com/parse-community/parse-server
• WEBgithub.com/parse-community/parse-server/pull/10195
• WEBgithub.com/parse-community/parse-server/pull/10196