CVE-2026-41161: Sync-In Server

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

Sync-in Server is a secure, open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.2.0, the /api/auth/login endpoint contains a logic flaw that allows unauthenticated remote attackers to enumerate valid usernames by measuring the application's response time. This issue has been patched in version 2.2.0.

Affected products

• Sync-In Sync-In Server: before 2.2.0 (fixed in 2.2.0)

Published 2026-05-08. Last modified 2026-06-17.