CVE-2026-41161

Username Enumeration via Timing Attack

CVSS 6.9 MEDIUMEPSS 0.3%CWE-208

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.9EPSS 0.3%KEV nãoPoC —Patch —

Lifecycle

08 May 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Affected products

Sync-in · server

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References

https://github.com/Sync-in/server/releases/tag/v2.2.0 https://github.com/Sync-in/server/security/advisories/GHSA-43fj-qp3h-hrh5