Vulnerability · Published Mar 18, 2026 · Assigned by GitHub_M

CVE-2026-32742Parse Server session creation endpoint allows overwriting server-generated session fields

Medium 4.3

In plain English

A medium-severity security flaw in parse-server from parse-community. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 74.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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`.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	parse-server	9.6.0-alpha.17	GHSA-5v7g-9h8f-8pgg
npm	parse-server	8.6.42	GHSA-5v7g-9h8f-8pgg

Affected products (as reported)

Vendor	Product	Versions
parse-community	parse-server	>= 9.0.0, < 9.6.0-alpha.17< 8.6.42

Weakness: CWE-915 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References

https://github.com/parse-community/parse-server/security/advisories/GHSA-5v7g-9h8f-8pgg x_refsource_CONFIRM
https://github.com/parse-community/parse-server/pull/10195 x_refsource_MISC
https://github.com/parse-community/parse-server/pull/10196 x_refsource_MISC