CVE-2026-41161: Sync-in Server is a secure, open-source platform for file storage, sharing, collaboration, and syncing

Q: How do I fix CVE-2026-41161?

sync-in server: upgrade to 2.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-41161 being exploited?

CVE-2026-41161 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-41161 affect?

CVE-2026-41161 affects sync-in server. Severity is medium (CVSS 5.3). 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 val

Q: How urgent is CVE-2026-41161?

Priority 30/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-41161 is a medium-severity flaw (CVSS 5.3) affecting sync-in server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-208
Published	2026-05-08
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: sync-in

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-08 14:16 UTCPublished CVE record published
2026-10-26 19:10 UTCUpdated Record last modified

sync-in sync-in server UPGRADE

Affected: < 2.2.0

Fixed in: 2.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy sync-in-server || rpm -q sync-in-server || sync-in-server --version

2. UPGRADE to 2.2.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sync-in-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sync-in-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-41161?

sync-in server: upgrade to 2.2.0. Exact commands for each OS are on this page.

Is CVE-2026-41161 being exploited?

CVE-2026-41161 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-41161 affect?

CVE-2026-41161 affects sync-in server. Severity is medium (CVSS 5.3). 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 val

How urgent is CVE-2026-41161?

Priority 30/100. Remotely exploitable, no login, no user action

References

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