---
title: "CVE-2026-32242: Parse Server's OAuth2 adapter shares mutable state across providers via singleton instance"
url: https://erroneo.us/security/cve/CVE-2026-32242/
description: "CVE-2026-32242 (parse-server (npm)): Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-12
date_modified: 2026-03-13
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-32242"
kev: false
cvss: 9.1
epss: 0.00399
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-32242: Parse Server's OAuth2 adapter shares mutable state across providers via singleton instance

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.4% , percentile 33: FIRST’s model estimates a 0.4% chance of exploitation activity in the next 30 days, higher than 33% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes parse-server (npm) >= 9.0.0, < 9.6.0-alpha.11, fixed in 9.6.0-alpha.11 ; parse-server (npm) < 8.6.37, fixed in 8.6.37 . Check your lockfile, including transitive dependencies.

## What it is

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.11 and 8.6.37, Parse Server's built-in OAuth2 auth adapter exports a singleton instance that is reused directly across all OAuth2 provider configurations. Under concurrent authentication requests for different OAuth2 providers, one provider's token validation may execute using another provider's configuration, potentially allowing a token that should be rejected by one provider to be accepted because it is validated against a different provider's policy. Deployments that configure multiple OAuth2 providers via the oauth2: true flag are affected. This vulnerability is fixed in 9.6.0-alpha.11 and 8.6.37.

## Affected packages

- npm `parse-server` >= 9.0.0, < 9.6.0-alpha.11 → fixed: 9.6.0-alpha.11
- npm `parse-server` < 8.6.37 → fixed: 8.6.37

## Affected products (CVE record)

- parse-community parse-server: >= 9.0.0 < 9.6.0-alpha.11, < 8.6.37

## Severity

- GitHub_M CVSS 4.0: 9.1 `CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`
- GitHub CVSS 4.0: 9.1 `CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.40% probability of exploitation activity in the next 30 days; percentile 33.

## Sources

- [GitHub Advisory GHSA-2cjm-2gwv-m892](https://github.com/advisories/GHSA-2cjm-2gwv-m892)
- [CVE.org record CVE-2026-32242](https://www.cve.org/CVERecord?id=CVE-2026-32242)
- [NVD entry CVE-2026-32242](https://nvd.nist.gov/vuln/detail/CVE-2026-32242)
- [github.com](https://github.com/parse-community/parse-server/security/advisories/GHSA-2cjm-2gwv-m892)
- [github.com](https://github.com/parse-community/parse-server/releases/tag/8.6.37)
- [github.com](https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.11)

---
Source page: https://erroneo.us/security/cve/CVE-2026-32242/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt