CVE-2026-34224: Parse Server has an MFA single-use token bypass via concurrent authData login requests

March 29, 2026

An attacker who possesses a valid authentication provider token and a single MFA recovery code or SMS one-time password can create multiple authenticated sessions by sending concurrent login requests via the authData login endpoint. This defeats the single-use guarantee of MFA recovery codes and SMS one-time passwords, allowing session persistence even after the legitimate user revokes detected sessions.

References

github.com/advisories/GHSA-w73w-g5xw-rwhf
github.com/parse-community/parse-server
github.com/parse-community/parse-server/pull/10326
github.com/parse-community/parse-server/pull/10327
github.com/parse-community/parse-server/security/advisories/GHSA-w73w-g5xw-rwhf
nvd.nist.gov/vuln/detail/CVE-2026-34224

Code Behaviors & Features

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