CVE-2026-33409

UNKNOWN 0.0

Parse Server: Auth provider validation bypass on login via partial authData

CVSS Score

0.0

EPSS Score

0.1%

EPSS Percentile

21th

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.

CWE	CWE-287
Vendor	parse-community
Product	parse-server
Published	Mar 24, 2026
Last Updated	Mar 25, 2026

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Affected Versions

parse-community / parse-server

< 8.6.52 >= 9.0.0, < 9.6.0-alpha.41

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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