CVE-2026-39321
CVE-2026-39321 · Parse Server has a login timing side-channel reveals user existence
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 6.3 · Medium · EPSS 0.4% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
parse-server
- Versions
- >= 9.0.0, < 9.8.0-alpha.6: Affected
- < 8.6.74: Affected
No fix published
parse-server npm
- Affected ranges
- SEMVER: ≥ 9.0.0, < 9.8.0-alpha.6
Update to 9.8.0-alpha.6
parse-server npm
- Affected ranges
- SEMVER: < 8.6.74
Update to 8.6.74