EUVD-2026-19818
GHSA-mmpq-5hcv-hf2v
CVSS Vector
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4Description
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.
Analysis
Parse Server versions prior to 9.8.0-alpha.6 and 8.6.74 leak valid usernames through timing side-channel attacks on the login endpoint, allowing unauthenticated attackers to enumerate existing user accounts by measuring response latency differences between non-existent users and incorrect password attempts. The vulnerability exploits inadequate constant-time comparison in password verification, enabling account enumeration without authentication and with moderate attack complexity.
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