CVE-2026-33409

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.52 and 9.6.0-alpha.41, an authentication bypass vulnerability allows an attacker to log in as any user who has linked a third-party authentication provider, without knowing the user's credentials. The attacker only needs to know the user's provider ID to gain full access to their account, including a valid session token. This affects Parse Server deployments where the server option allowExpiredAuthDataToken is set to true. The default value is false. This issue has been patched in versions 8.6.52 and 9.6.0-alpha.41.

The following products are affected by CVE-2026-33409 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-33409.

URL	Resource
https://github.com/parse-community/parse-server/commit/8d7df5639c4a35768fe8b78b4580b30e8a74721c
https://github.com/parse-community/parse-server/commit/98f4ba5bcf2c199bfe6225f672e8edcd08ba732d
https://github.com/parse-community/parse-server/pull/10246
https://github.com/parse-community/parse-server/pull/10247
https://github.com/parse-community/parse-server/security/advisories/GHSA-pfj7-wv7c-22pr