GitHub Advisoryadvisory · npm
GHSA-w73w-g5xw-rwhf Parse Server has an MFA single-use token bypass via concurrent authData login requests
LOW
Official page ↗
- Aliases
- CVE-2026-34224
- Ecosystem
- npm
- Packages
- parse-server
- Severity
- Low
- CVSS vector
- 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
- Weaknesses
- CWE-367
- Reviewed
- 2026-03-29
Affected packages
• npm parse-server: >= 9.0.0, < 9.7.0-alpha.8 → fixed in 9.7.0-alpha.8
• npm parse-server: < 8.6.64 → fixed in 8.6.64
Description
Impact
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.
Patches
The fix adds optimistic locking to the authData login path, ensuring that concurrent database updates for the same user fail when the original MFA token array has already been modified by another request.
Workarounds
There is no known workaround.
Related
Alias · CVE (1)
- CVE-2026-34224 Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. vulnerability
Weakness · CWE (1)
- CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition weakness
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-w73w-g5xw-rwhf web
- https://nvd.nist.gov/vuln/detail/CVE-2026-34224 advisory
- https://github.com/parse-community/parse-server/pull/10326 web
- https://github.com/parse-community/parse-server/pull/10327 web
- https://github.com/parse-community/parse-server/commit/661f160edac8daac0486bc94413cf9652876ab92 web
- https://github.com/parse-community/parse-server/commit/e7efbebba398ce6abe5b6b6fb9829c6ebe310fbf web
- https://github.com/parse-community/parse-server package