CVE-2026-34224
Parse Server: MFA single-use token bypass via concurrent authData login requests
- State
- Published
- Severity
- 2.1 Low
- Published
- Mar 31, 2026
- Updated
- Apr 2, 2026
- Reserved
- Mar 26, 2026
Description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.64 and 9.7.0-alpha.8, 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. This issue has been patched in versions 8.6.64 and 9.7.0-alpha.8.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 2.1 Low | CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N | GitHub_M |
| 3.1 | 4.4 Medium | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N | CISA-ADP |
Weaknesses
- CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
Affected Products
| Product | Versions |
|---|---|
parse-serverparse-community |
|
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-w73w-g5xw-rwhf
- https://github.com/parse-community/parse-server/pull/10326
- https://github.com/parse-community/parse-server/pull/10327
- https://github.com/parse-community/parse-server/commit/661f160edac8daac0486bc94413cf9652876ab92
- https://github.com/parse-community/parse-server/commit/e7efbebba398ce6abe5b6b6fb9829c6ebe310fbf
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