#VU125010 Time-of-check Time-of-use (TOCTOU) Race Condition in Parse Server - CVE-2026-33624
Published: April 6, 2026
Vulnerability identifier: #VU125010
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-33624
CWE-ID: CWE-367
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Parse Server
Parse Server
Software vendor:
Parse Community
Parse Community
Description
The vulnerability allows a remote user to bypass single-use restrictions on MFA recovery codes.
The vulnerability exists due to a time-of-check time-of-use race condition in the login handler when processing concurrent login requests that use an MFA recovery code. A remote privileged user can send concurrent login requests with a valid password and recovery code to bypass single-use restrictions on MFA recovery codes.
Exploitation requires possession of the user's password, a valid recovery code, and the ability to issue concurrent requests within milliseconds.
Remediation
Install security update from vendor's website.