Medium 6.9Published May 8, 2026

CVE-2026-41161Username Enumeration via Timing Attack

Updated under an hour ago (Oct 27, 2026, 10:00 PM ET)

Does this affect you?

It affects Sync-in server and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Sync-in server

Exploited in the last 30 days

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: 6.9 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness (CWE): CWE-208
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Sync-in server sync_in:server (from the name)	before 2.2.0	CNA record
sync-in sync-in_server sync-in:sync-in_server	before 2.2.0	NVD

References

References

https://github.com/Sync-in/server/security/advisories/GHSA-43fj-qp3h-hrh5	x-refsource-confirm, vendor-advisory
https://github.com/Sync-in/server/releases/tag/v2.2.0	x-refsource-misc, patch, product

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.