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.

Published 2026-05-08 · last modified 2026-10-26.

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.

EPSS exploit prediction

EPSS: 0.003 (26.6th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.003 · change: -0.001

Affected products

Sync-In Server — versions < 2.2.0
Sync-In Server

Weakness classification (CWE)

CWE-208

References

github.com/Sync-in/server/security/advisories/GHSA-43fj-qp3h-hrh5 (Vendor Advisory)
github.com/Sync-in/server/releases/tag/v2.2.0 (Product, Patch)

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.