CVE-2026-31901
MEDIUM
GHSA-w54v-hf9p-8856
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Lifecycle Timeline
3Description
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.
Analysis
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. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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