CVE-2026-39321: Parseplatform Parse-Server

Low severity, CVSS 3.7. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Parseplatform Parse-Server: before 8.6.74 (fixed in 8.6.74); from 9.0.0, before 9.8.0 (fixed in 9.8.0); version 9.8.0 only

Published 2026-04-07. Last modified 2026-06-17.