CVE-2026-58272

CVE-2026-58272 · Sync-in Server has Username/Login Enumeration via Timing Side-Channel on POST /api/auth/login (incomplete fix of the prior timing-attack advisory)

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Versions prior to 2.4.1 contain an observable timing discrepancy in the login endpoint because authentication attempts for nonexistent accounts return without performing the bcrypt comparison used for existing accounts. An unauthenticated attacker can measure response times to enumerate valid usernames or email addresses, facilitating credential-stuffing, password-spraying, and phishing attacks. Version 2.4.1 contains a patch.

CVSS 5.3 · Medium · EPSS 0.4% · Fix available

Published

2026-09-21T20:31:46.272Z

Updated

2026-09-23T19:42:05.134Z

Stack: node

Check your server →