# 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.

- **Severity:** Low 2.1 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 12 May 2026
- **Updated:** 13 May 2026
- **Also known as:** BIT-parse-2026-43930, GHSA-jpq4-7fmq-q5fj

## 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 (Concurrent Execution using Shared Resource with Improper Synchronization)

## 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 | Ecosystem | 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: 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](https://insights.sbomify.com/CVE-2026-30966/): Parse Server role escalation and CLP bypass via direct `_Join` table write (critical 10.0)
- [CVE-2024-27298](https://insights.sbomify.com/CVE-2024-27298/): Parse Server literalizeRegexPart SQL Injection (critical 10.0)
- [CVE-2022-24760](https://insights.sbomify.com/CVE-2022-24760/): Command Injection in Parse server (critical 10.0)
- [CVE-2026-30965](https://insights.sbomify.com/CVE-2026-30965/): Parse Server session token exfiltration via `redirectClassNameForKey` query parameter (critical 9.9)
- [CVE-2023-36475](https://insights.sbomify.com/CVE-2023-36475/): Parse Server vulnerable to remote code execution via MongoDB BSON parser through prototype pollution (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-43930 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-43930 in the wild and no public exploit code.

Affected packages and fixed versions:
- parse-server (npm): affected all versions; fixed in 8.6.76
- parse-server (npm): affected all versions; fixed in 8.6.76
- parse-server (npm): affected from 9.0.0; fixed in 9.9.0-alpha.2
- parse-server (npm): affected from 9.0.0; fixed in 9.9.0-alpha.2
- parse (Bitnami): affected all versions; fixed in 8.6.76, 9.9.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-43930/ (Markdown: https://insights.sbomify.com/CVE-2026-43930/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-43930
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-43930
- OSV: https://osv.dev/vulnerability/CVE-2026-43930

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-43930/
Summaries are generated and may contain mistakes; the official description above is the record.