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.
References (2)
Core 2
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/Sync-in/server/security/advisories/GHSA-43fj-qp3h-hrh5
X_Refsource_Misc x_refsource_misc
https://github.com/Sync-in/server/releases/tag/v2.2.0
Scores
CVSS v3
5.3
EPSS
0.0033
EPSS Percentile
24.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-208
Status
published
Products (3)
sync-in/server
0 - 2.2.0npm
Sync-in/server
< 2.2.0
sync-in/sync-in_server
< 2.2.0
Published
May 08, 2026
Tracked Since
May 08, 2026