CVE-2026-43930 Parse Server: MFA SMS one-time password accepted twice under concurrent login
An attacker with stolen credentials and intercepted SMS can race login requests to bypass MFA single-use restrictions and gain account access.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43930?
CVE-2026-43930 is a low-severity vulnerability in Parseplatform Parse-Server, published on 12 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-362
Which versions are affected by CVE-2026-43930?
5 open source packages ship an affected version, including parse-server and parse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
parse-server npm | All versions | 8.6.76 |
parse-server npm | All versions | 8.6.76 |
parse-server npm | From 9.0.0 | 9.9.0-alpha.2 |
parse-server npm | From 9.0.0 | 9.9.0-alpha.2 |
parse Bitnami | All versions | 8.6.76, 9.9.0 |
Products include Parseplatform Parse-Server.
How do I fix CVE-2026-43930?
Upgrade parse-server to a fixed version for your release line: 8.6.76 or 9.9.0-alpha.2.
Is CVE-2026-43930 being exploited?
There is no known exploitation of CVE-2026-43930 in the wild and no public exploit code.
Other vulnerabilities in Parseplatform Parse-Server
- CVE-2026-30966 Parse Server role escalation and CLP bypass via direct `_Join` table write
- CVE-2024-27298 Parse Server literalizeRegexPart SQL Injection
- CVE-2022-24760 Command Injection in Parse server
- CVE-2026-30965 Parse Server session token exfiltration via `redirectClassNameForKey` query parameter
- CVE-2023-36475 Parse Server vulnerable to remote code execution via MongoDB BSON parser through prototype pollution
Sources
Also known as BIT-parse-2026-43930, GHSA-jpq4-7fmq-q5fj.