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CVE-2026-33624— Parse Server: MFA recovery code single-use bypass via concurrent requests

Quick assessment

Affected
parse-community parse-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Parse Server是Parse Platform开源的一个开源后端，可以部署到任何可以运行 Node.js 的基础设施。 Parse Server 8.6.60之前版本和9.6.0-alpha.54之前版本存在安全漏洞，该漏洞源于并发登录请求可无限次重用MFA恢复代码，可能导致绕过单次使用限制。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-33624

Vulnerability Information
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Vulnerability Title
Parse Server: MFA recovery code single-use bypass via concurrent requests
Source: CVE Program / CVE List V5
Vulnerability Description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.60 and 9.6.0-alpha.54, 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. This issue has been patched in versions 8.6.60 and 9.6.0-alpha.54.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
Parse Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Parse Server是Parse Platform开源的一个开源后端，可以部署到任何可以运行 Node.js 的基础设施。 Parse Server 8.6.60之前版本和9.6.0-alpha.54之前版本存在安全漏洞，该漏洞源于并发登录请求可无限次重用MFA恢复代码，可能导致绕过单次使用限制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
parse-community parse-server < 8.6.60 -

II. Public POCs for CVE-2026-33624

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III. Intelligence Information for CVE-2026-33624

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Patches & Fixes for CVE-2026-33624 (4)

Vendor Advisories for CVE-2026-33624 (1)

Same Patch Batch · parse-community · 2026-03-24 · 11 CVEs total

CVE-2026-33538 Parse Server: Denial of service via unindexed database query for unconfigured auth provide
CVE-2026-33527 Parse Server: Session update endpoint allows overwriting server-generated session fields
CVE-2026-33323 Parse Server: Email verification resend page leaks user existence
CVE-2026-33429 Parse Server: Protected field change detection oracle via LiveQuery watch parameter
CVE-2026-33508 Parse Server: LiveQuery subscription query depth bypass
CVE-2026-33421 Parse Server: LiveQuery bypasses CLP pointer permission enforcement
CVE-2026-33498 Parse Server: Query condition depth bypass via pre-validation transform pipeline
CVE-2026-33409 Parse Server: Auth provider validation bypass on login via partial authData
CVE-2026-33539 Parse Server: SQL injection via aggregate and distinct field names in PostgreSQL adapter
CVE-2026-33627 Parse Server: Auth data exposed via /users/me endpoint

IV. Related Vulnerabilities

Same product: parse-server
Same vendor: parse-community
Same weakness: CWE-367

V. Comments for CVE-2026-33624

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