Vulnerability Description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.76 and 9.9.0-alpha.2, a race condition in the MFA SMS one-time password (OTP) login path allows two concurrent /login requests carrying the same OTP to both succeed and both receive valid session tokens, breaking the single-use property of the OTP. The vulnerability requires the attacker to already possess the victim's password and intercept the active SMS OTP (e.g. via SIM swap, network mirror, or phishing relay) and to race the legitimate login request, so the practical attack surface is narrow. This vulnerability is fixed in 8.6.76 and 9.9.0-alpha.2.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Parseplatform | Parse-Server | < 8.6.76 |
Related Weaknesses (CWE)
References
- https://github.com/parse-community/parse-server/pull/10448Issue TrackingPatch
- https://github.com/parse-community/parse-server/pull/10449Issue TrackingPatch
- https://github.com/parse-community/parse-server/security/advisories/GHSA-jpq4-7fMitigationVendor Advisory
FAQ
What is CVE-2026-43930?
CVE-2026-43930 is a vulnerability with a CVSS score of 5.9 (MEDIUM). Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.76 and 9.9.0-alpha.2, a race condition in the MFA SMS one-time password (OTP) login...
How severe is CVE-2026-43930?
CVE-2026-43930 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-43930?
Check the references section above for vendor advisories and patch information. Affected products include: Parseplatform Parse-Server.