Paper/Archive/CVE-2026-33409

CVE-2026-33409

parse-community parse-server — Parse Server: Auth provider validation bypass on login via partial authData

CVSS 9.1 (NVD)9.1 / 10 × 3027.3 Not in CISA KEV+300.0 EPSS percentile 40.9.409 × 208.2 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

parse-server< 8.6.52–CNA

parse-server>= 9.0.0, < 9.6.0-alpha.41–CNA

Scores by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

GitHub_M (CNA)7.0CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

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