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Open-source package vulnerability · npm

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

criticalCVSS 4.0 9.1GHSA-2cjm-2gwv-m892

Impact 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…

Published Mar 12, 2026 · Updated Mar 13, 2026

Affected packages

parse-server

Ecosystem
npm
Affected
>= 9.0.0, < 9.6.0-alpha.11
Fixed in
9.6.0-alpha.11
Check
npm ls parse-server

parse-server

Ecosystem
npm
Affected
< 8.6.37
Fixed in
8.6.37
Check
npm ls parse-server

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

Impact

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.

Patches

The fix ensures that a new adapter instance is created for each provider instead of reusing the singleton, so each provider's configuration is isolated.

Workarounds

There is no known workaround. If only a single OAuth2 provider is configured, the race condition cannot occur.

References

  • GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-2cjm-2gwv-m892
  • Fix Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.11
  • Fix Parse Server 8: https://github.com/parse-community/parse-server/releases/tag/8.6.37

Credited to fancymalware, mtrezza.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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