What is CVE-2026-41161?

CVE-2026-41161 is a medium-severity vulnerability in Sync-In Server, classified under CWE-208. CVSS score: 5.3/10. Published 2026-05-08.

How severe is CVE-2026-41161?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Sync-In Server

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.

EPSS: 0.003 (26.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Sync-in Server — versions < 2.2.0
Sync-in Sync-in_server

Weakness classification (CWE)

CWE-208

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Product, Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-41161?: CVE-2026-41161 is a medium-severity vulnerability in Sync-In Server, classified under CWE-208. CVSS score: 5.3/10. Published 2026-05-08.
How severe is CVE-2026-41161?: Medium severity. CVSS v3 base score is 5.3 out of 10.