Summary
Workarounds
There are no known workarounds.
Impact
An attacker who obtains a user's password and a single MFA recovery code can reuse that recovery code an unlimited number of times by sending concurrent login requests. This defeats the single-use design of recovery codes. The attack requires the user's password, a valid recovery code, and the ability to send concurrent requests within milliseconds.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
The login handler now uses optimistic locking when updating auth data that contains consumed single-use tokens. If a concurrent request has already modified the recovery array, the update fails and the login is rejected.
Frequently Asked Questions
- What is CVE-2026-33624? CVE-2026-33624 is a low-severity security vulnerability in parse-server (npm), affecting versions >= 9.0.0, < 9.6.0-alpha.54. It is fixed in 9.6.0-alpha.54, 8.6.60.
- Which versions of parse-server are affected by CVE-2026-33624? parse-server (npm) versions >= 9.0.0, < 9.6.0-alpha.54 is affected.
- Is there a fix for CVE-2026-33624? Yes. CVE-2026-33624 is fixed in 9.6.0-alpha.54, 8.6.60. Upgrade to this version or later.
- Is CVE-2026-33624 exploitable, and should I be worried? Whether CVE-2026-33624 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-33624 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-33624?
- Upgrade
parse-serverto 9.6.0-alpha.54 or later - Upgrade
parse-serverto 8.6.60 or later
- Upgrade