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CVE-2026-39321— Parse Server has a login timing side-channel reveals user existence

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 9.8.0-alpha.6之前版本和8.6.74之前版本存在安全漏洞，该漏洞源于登录端点响应时间差异，可能导致用户名枚举。

AI Predicted 5.3 Difficulty: Easy EPSS 0.23% · P14

Possible ATT&CK Techniques 1 AI

T1595.002 · Vulnerability Scanning
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I. Basic Information for CVE-2026-39321

Vulnerability Information
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Vulnerability Title
Parse Server has a login timing side-channel reveals user existence
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 9.8.0-alpha.6 and 8.6.74, he login endpoint response time differs measurably depending on whether the submitted username or email exists in the database. When a user is not found, the server responds immediately. When a user exists but the password is wrong, a bcrypt comparison runs first, adding significant latency. This timing difference allows an unauthenticated attacker to enumerate valid usernames. This vulnerability is fixed in 9.8.0-alpha.6 and 8.6.74.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
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 9.8.0-alpha.6之前版本和8.6.74之前版本存在安全漏洞，该漏洞源于登录端点响应时间差异，可能导致用户名枚举。
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, < 9.8.0-alpha.6 -

II. Public POCs for CVE-2026-39321

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III. Intelligence Information for CVE-2026-39321

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Patches & Fixes for CVE-2026-39321 (1)

IV. Related Vulnerabilities

Same product: parse-server
Same vendor: parse-community
Same weakness: CWE-208

V. Comments for CVE-2026-39321

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