{"id":"CVE-2026-33409","aliases":["BIT-parse-2026-33409","GHSA-pfj7-wv7c-22pr"],"url":"https://o3.security/vulnerability/CVE-2026-33409","summary":"Parse Server: Auth provider validation bypass on login via partial authData","details":"### Impact\n\nAn 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.\n\nThis affects Parse Server deployments where the server option `allowExpiredAuthDataToken` is set to `true`. The default value is `false`.\n\n### Patches\n\nAuth providers are now always validated on login, regardless of the `allowExpiredAuthDataToken` setting. The option `allowExpiredAuthDataToken` has been deprecated and will be removed in a future major version.\n\n### Workarounds\n\nSet `allowExpiredAuthDataToken` to `false` (the default) or remove the option from the server configuration.","published":"2026-03-24T18:11:36.824Z","modified":"2026-08-12T03:51:40.381952562Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"parse-server","fixedVersion":"9.6.0-alpha.41"},{"ecosystem":"npm","name":"parse-server","fixedVersion":"8.6.52"}],"fix":{"url":"https://github.com/parse-community/parse-server/commit/8d7df5639c4a35768fe8b78b4580b30e8a74721c","label":"parse-community/parse-server@8d7df56"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33409.json"},{"type":"ADVISORY","url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-pfj7-wv7c-22pr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33409"},{"type":"FIX","url":"https://github.com/parse-community/parse-server/commit/8d7df5639c4a35768fe8b78b4580b30e8a74721c"},{"type":"FIX","url":"https://github.com/parse-community/parse-server/commit/98f4ba5bcf2c199bfe6225f672e8edcd08ba732d"},{"type":"FIX","url":"https://github.com/parse-community/parse-server/pull/10246"},{"type":"FIX","url":"https://github.com/parse-community/parse-server/pull/10247"},{"type":"PACKAGE","url":"https://github.com/parse-community/parse-server"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:40.381952562Z"}}