SB2026052314 - Race condition in parse-server

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-43930)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote user to obtain a valid session token by reusing a single-use sms one-time password.

The vulnerability exists due to a race condition in the mfa sms one-time password login path when processing concurrent /login requests carrying the same otp. A remote user can send a concurrent login request with the same intercepted otp to obtain a valid session token by reusing a single-use sms one-time password.

Exploitation requires possession of the victim's password, interception of the active sms otp, and racing the legitimate login request.

Remediation

Install update from vendor's website.

References

• https://github.com/parse-community/parse-server/security/advisories/GHSA-jpq4-7fmq-q5fj
• https://github.com/parse-community/parse-server/pull/10448