What is CVE-2026-32742?

CVE-2026-32742 is a medium-severity vulnerability in Parse-Community Parse-Server, classified under Improperly Controlled Modification of Dynamically-Determined Object Attributes. CVSS score: 4.3/10. Published 2026-03-18.

How severe is CVE-2026-32742?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Parse-Community Parse-Server

CVE-2026-32742

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`.

Vulnerability class: Mass Assignment

Published 2026-03-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (30.3th percentile), scored 2026-09-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001

Affected products

Parse-Community Parse-Server — versions >= 9.0.0, < 9.6.0-alpha.17, < 8.6.42
Parseplatform Parse-Server — versions 9.6.0

Weakness classification (CWE)

CWE-915 — Improperly Controlled Modification of Dynamically-Determined Object Attributes

References

github.com/parse-community/parse-server/security/advisories/GHSA-5v7g-9h8f-8pgg (Vendor Advisory)
github.com/parse-community/parse-server/pull/10195 (Issue Tracking)
github.com/parse-community/parse-server/pull/10196 (Issue Tracking)

Frequently asked questions

What is CVE-2026-32742?: CVE-2026-32742 is a medium-severity vulnerability in Parse-Community Parse-Server, classified under Improperly Controlled Modification of Dynamically-Determined Object Attributes. CVSS score: 4.3/10. Published 2026-03-18.
How severe is CVE-2026-32742?: Medium severity. CVSS v3 base score is 4.3 out of 10.