CVE-2026-39321

LOW

Parse Server has a login timing side-channel reveals user existence

Title source: cna
STIX 2.1

Description

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.

References (3)

Scores

CVSS v3 3.7
EPSS 0.0003
EPSS Percentile 7.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-208
Status published
Products (5)
npm/parse-server 9.0.0 - 9.8.0-alpha.6npm
parse-community/parse-server < 8.6.74
parse-community/parse-server >= 9.0.0, < 9.8.0-alpha.6
parseplatform/parse-server 9.8.0 alpha1 (5 CPE variants)
parseplatform/parse-server < 8.6.74
Published Apr 07, 2026
Tracked Since Apr 08, 2026