CVE-2026-34224: CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition in parse-community parse-server
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.
AI Analysis
Technical Summary
Parse Server, an open source backend for Node.js, had a time-of-check to time-of-use (TOCTOU) race condition vulnerability (CWE-367) in its authData login endpoint. This flaw allowed attackers possessing a valid authentication provider token plus a single MFA recovery code or SMS OTP to bypass the single-use limitation by issuing concurrent login requests, resulting in multiple active sessions. The vulnerability affects parse-server versions before 8.6.64 and versions from 9.0.0 up to but not including 9.7.0-alpha.8. The vendor has released patches in versions 8.6.64 and 9.7.0-alpha.8 to fix this issue.
Potential Impact
The vulnerability allows attackers to create multiple authenticated sessions using a single MFA recovery code or SMS OTP, defeating the single-use guarantee of these authentication factors. This can lead to unauthorized session persistence even after the legitimate user revokes sessions, potentially increasing the risk of unauthorized access. The CVSS 4.0 base score is 2.1, indicating low severity. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade parse-server to version 8.6.64 or later, or to version 9.7.0-alpha.8 or later, where this vulnerability has been patched. No other mitigations are indicated by the vendor advisory.
CVE-2026-34224: CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition in parse-community parse-server
Description
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.
CVSS v4.0
Score 2.1low
Affected software
pkg:npm/parse-community/parse-serverRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Parse Server, an open source backend for Node.js, had a time-of-check to time-of-use (TOCTOU) race condition vulnerability (CWE-367) in its authData login endpoint. This flaw allowed attackers possessing a valid authentication provider token plus a single MFA recovery code or SMS OTP to bypass the single-use limitation by issuing concurrent login requests, resulting in multiple active sessions. The vulnerability affects parse-server versions before 8.6.64 and versions from 9.0.0 up to but not including 9.7.0-alpha.8. The vendor has released patches in versions 8.6.64 and 9.7.0-alpha.8 to fix this issue.
Potential Impact
The vulnerability allows attackers to create multiple authenticated sessions using a single MFA recovery code or SMS OTP, defeating the single-use guarantee of these authentication factors. This can lead to unauthorized session persistence even after the legitimate user revokes sessions, potentially increasing the risk of unauthorized access. The CVSS 4.0 base score is 2.1, indicating low severity. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade parse-server to version 8.6.64 or later, or to version 9.7.0-alpha.8 or later, where this vulnerability has been patched. No other mitigations are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-26T16:22:29.033Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 69cbdff9e6bfc5ba1d1e69bb
Added to database: 03/31/2026, 14:53:45 UTC
Last enriched: 04/07/2026, 23:59:21 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 149
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.