CVE-2026-41161

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

6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 26% of CVEs (scores of 2026-10-26)

CWE

CWE-208

Published

2026-05-08

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• sync-in:sync-in_server

Packages (OSV)

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

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