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CVE-2026-43930— Parse Server: MFA SMS one-time password accepted twice under concurrent login

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 8.6.76之前版本和9.9.0-alpha.2之前版本存在竞争条件问题漏洞，该漏洞源于MFA短信一次性密码登录路径中的竞争条件，可能导致两个并发请求使用相同一次性密码同时成功登录。

AI Predicted 8.1 Difficulty: Hard EPSS 0.24% · P15

Affected Version Matrix 2

VendorProduct Version RangeStatus
parse-community parse-server >= 9.0.0, < 9.9.0-alpha.2 affected
< 8.6.76 affected
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I. Basic Information for CVE-2026-43930

Vulnerability Information
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Vulnerability Title
Parse Server: MFA SMS one-time password accepted twice under concurrent login
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 8.6.76 and 9.9.0-alpha.2, a race condition in the MFA SMS one-time password (OTP) login path allows two concurrent /login requests carrying the same OTP to both succeed and both receive valid session tokens, breaking the single-use property of the OTP. The vulnerability requires the attacker to already possess the victim's password and intercept the active SMS OTP (e.g. via SIM swap, network mirror, or phishing relay) and to race the legitimate login request, so the practical attack surface is narrow. This vulnerability is fixed in 8.6.76 and 9.9.0-alpha.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
Parse Server 竞争条件问题漏洞
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 8.6.76之前版本和9.9.0-alpha.2之前版本存在竞争条件问题漏洞，该漏洞源于MFA短信一次性密码登录路径中的竞争条件，可能导致两个并发请求使用相同一次性密码同时成功登录。
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 >= 9.0.0, < 9.9.0-alpha.2 -

II. Public POCs for CVE-2026-43930

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III. Intelligence Information for CVE-2026-43930

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Patches & Fixes for CVE-2026-43930 (2)

Vendor Advisories for CVE-2026-43930 (1)

IV. Related Vulnerabilities

Same product: parse-server
Same vendor: parse-community
Same weakness: CWE-362

V. Comments for CVE-2026-43930

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