CVE-2026-39321
Parse Server has a login timing side-channel reveals user existence
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-208 |
| Vendor | parse-community |
| Product | parse-server |
| Published | Apr 7, 2026 |
| Last Updated | Apr 7, 2026 |
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Affected Versions
parse-community / parse-server
>= 9.0.0, < 9.8.0-alpha.6 < 8.6.74