CVE-2026-31901

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.

• CWE-204

• https://github.com/parse-community/parse-server/releases/tag/8.6.34Product, Release Notes
• https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.8Product, Release Notes
• https://github.com/parse-community/parse-server/security/advisories/GHSA-w54v-hf9p-8856Patch, Vendor Advisory

Published

Mar 11, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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