Race Condition Affecting parse-server package, versions <8.6.76>=9.0.0-alpha.1 <9.9.0-alpha.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-PARSESERVER-16424355
- published6 May 2026
- disclosed5 May 2026
- creditadrgs
Introduced: 5 May 2026
NewCVE-2026-43930 (opens in a new tab)How to fix?
Upgrade parse-server to version 8.6.76, 9.9.0-alpha.2 or higher.
Overview
parse-server is a version of the Parse backend that can be deployed to any infrastructure that can run Node.js.
Affected versions of this package are vulnerable to Race Condition due to a race condition in the login process. An attacker can obtain multiple valid session tokens by submitting concurrent requests with the same intercepted one-time password. This is only exploitable if the attacker already possesses the victim's password and can intercept the active SMS OTP, and is able to race the legitimate login request.
Workaround
This vulnerability can be mitigated by disabling SMS MFA and using TOTP instead, or by placing a rate limiter on the /login endpoint to reduce concurrent-request burst capacity.