Race condition in parse-server - CVE-2026-43930
Published: May 23, 2026
Vulnerability identifier: #VU132201
CSH Severity: Low
CVSS v4: 2.3 [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]
CVE-ID: CVE-2026-43930
CWE-ID: CWE-362
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
parse-server
How to mitigate CVE-2026-43930
Install security update from vendor's website.
parse-server - addressed in versions 8.6.76, 9.9.0 alpha.2