CVE-2026-58272: Sync-In Server

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Sync-In Server: before 2.4.1 (fixed in 2.4.1)

Published 2026-09-21. Last modified 2026-09-30.