CVE-2026-41161

EUVD-2026-28551
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 24%
Affected Products (NVD)
VendorProductVersion
sync-insync-in_server
𝑥
< 2.2.0
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/Sync-in/server/releases/tag/v2.2.0
https://github.com/Sync-in/server/security/advisories/GHSA-43fj-qp3h-hrh5
https://github.com/Sync-in/server/security/advisories/GHSA-43fj-qp3h-hrh5