CVE-2026-41161: Sync-in Server has Username Enumeration via Timing Attack

April 15, 2026 (updated May 12, 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/releases/tag/v2.2.0
github.com/Sync-in/server/security/advisories/GHSA-43fj-qp3h-hrh5
github.com/advisories/GHSA-43fj-qp3h-hrh5
nvd.nist.gov/vuln/detail/CVE-2026-41161

Code Behaviors & Features

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