Node.js CVE-2026-31901
MEDIUM
GHSA-w54v-hf9p-8856
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Lifecycle Timeline
3DescriptionGitHub Advisory
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.34 and 9.6.0-alpha.8, the email verification endpoint (/verificationEmailRequest) returns distinct error responses depending on whether an email address belongs to an existing user, is already verified, or does not exist. An attacker can send requests with different email addresses and observe the error codes to determine which email addresses are registered in the application. This is a user enumeration vulnerability that affects any Parse Server deployment with email verification enabled (verifyUserEmails: true). This vulnerability is fixed in 8.6.34 and 9.6.0-alpha.8.
AnalysisAI
Parse Server versions before 8.6.34 and 9.6.0-alpha.8 leak user registration status through differential error responses on the email verification endpoint, enabling attackers to enumerate valid email addresses in the system when email verification is enabled. Deployments with verifyUserEmails set to true are vulnerable to this user enumeration attack, which allows an attacker to systematically identify registered accounts by analyzing response codes from the /verificationEmailRequest endpoint. No patch is currently available for affected installations.
Technical ContextAI
affects Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js.. Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.34 and 9.6.0-alpha.8, the email verification endpoint (/verificationEmailRequest) returns distinct error responses depending on whether an email address belongs to an existing user, is already verified, or does not exist. An attacker can send requests with different email addresses and observe the error codes to determine which email addresses are registered in the application. Th
RemediationAI
Fixed in version 8.6.34.
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Same weakness CWE-204 – Observable Response Discrepancy
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External POC / Exploit Code
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