CVE-2026-34224: Parse Server: MFA single-use token bypass via concurrent authData login requests
Impact
An attacker who possesses a valid authentication provider token and a single MFA recovery code or SMS one-time password can create multiple authenticated sessions by sending concurrent login requests via the authData login endpoint. This defeats the single-use guarantee of MFA recovery codes and SMS one-time passwords, allowing session persistence even after the legitimate user revokes detected sessions.
Patches
The fix adds optimistic locking to the authData login path, ensuring that concurrent database updates for the same user fail when the original MFA token array has already been modified by another request.
Workarounds
There is no known workaround.
Other sources
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.64 and 9.7.0-alpha.8, an attacker who possesses a valid authentication provider token and a single MFA recovery code or SMS one-time password can create multiple authenticated sessions by sending concurrent login requests via the authData login endpoint. This defeats the single-use guarantee of MFA recovery codes and SMS one-time passwords, allowing session persistence even after the legitimate user revokes detected sessions. This issue has been patched in versions 8.6.64 and 9.7.0-alpha.8.
— MITRE
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
npm/parse-serverto a version that resolves this vulnerability.Fixed in 8.6.64 - Upgrade
Upgrade
npm/parse-serverto a version that resolves this vulnerability.Fixed in 9.7.0-alpha.8 - Upgrade
Upgrade
Parse Serverto a version that resolves this vulnerability.Fixed in 8.6.64 - Upgrade
Upgrade
Parse Serverto a version that resolves this vulnerability.Fixed in 9.7.0-alpha.8
Event History
Frequently Asked Questions
What is the severity of CVE-2026-34224?
CVE-2026-34224 has been classified as a significant vulnerability due to potential multi-session exploits from valid authentication tokens with MFA codes.
How do I fix CVE-2026-34224?
To remediate CVE-2026-34224, upgrade to parse-server version 8.6.64 or 9.7.0-alpha.8 or later.
What type of attack does CVE-2026-34224 enable?
CVE-2026-34224 enables attackers to bypass the single-use requirement of MFA recovery codes, potentially allowing unauthorized access.
Who is affected by CVE-2026-34224?
CVE-2026-34224 affects users of npm's parse-server versions up to 8.6.64 and versions between 9.0.0 and 9.7.0-alpha.8.
What components of the system does CVE-2026-34224 impact?
CVE-2026-34224 impacts the authData login endpoint, specifically concerning authentication and multi-factor authentication mechanisms.