GHSA-43fj-qp3h-hrh5: Sync-in Server has Username Enumeration via Timing Attack

April 15, 2026

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.

References

github.com/Sync-in/server
github.com/Sync-in/server/security/advisories/GHSA-43fj-qp3h-hrh5
github.com/advisories/GHSA-43fj-qp3h-hrh5

Code Behaviors & Features

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