CVE-2026-41161

Username Enumeration via Timing Attack

State: Published
Severity: 6.9 Medium
Published: May 8, 2026
Updated: May 11, 2026
Reserved: Apr 17, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	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	GitHub_M

Weaknesses

CWE-208 Observable Timing Discrepancy

Affected Products

Product	Versions
serverSync-in	< 2.2.0Affected

References

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

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