CVE-2026-41161: CWE-208: Observable Timing Discrepancy in Sync-in server
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.
AI Analysis
Technical Summary
CVE-2026-41161 describes a timing side-channel vulnerability in Sync-in Server before version 2.2.0. The flaw exists in the /api/auth/login endpoint, where differences in response times can be observed by unauthenticated remote attackers to infer valid usernames. This information disclosure vulnerability is categorized under CWE-208 (Observable Timing Discrepancy). The issue has been addressed and fixed in Sync-in Server version 2.2.0.
Potential Impact
An attacker can remotely enumerate valid usernames on the Sync-in Server by measuring response time differences during login attempts. This can facilitate further targeted attacks such as credential stuffing or phishing. There is no indication of direct system compromise or data breach solely from this vulnerability. No known exploits have been reported in the wild.
Mitigation Recommendations
Upgrade Sync-in Server to version 2.2.0 or later, where this timing discrepancy vulnerability has been patched. Since this is an open-source product and not a cloud service, applying the official update is the recommended remediation. Patch status is confirmed by the vendor's versioning information.
CVE-2026-41161: CWE-208: Observable Timing Discrepancy in Sync-in server
Description
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 v4.0
Score 6.9medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-41161 describes a timing side-channel vulnerability in Sync-in Server before version 2.2.0. The flaw exists in the /api/auth/login endpoint, where differences in response times can be observed by unauthenticated remote attackers to infer valid usernames. This information disclosure vulnerability is categorized under CWE-208 (Observable Timing Discrepancy). The issue has been addressed and fixed in Sync-in Server version 2.2.0.
Potential Impact
An attacker can remotely enumerate valid usernames on the Sync-in Server by measuring response time differences during login attempts. This can facilitate further targeted attacks such as credential stuffing or phishing. There is no indication of direct system compromise or data breach solely from this vulnerability. No known exploits have been reported in the wild.
Mitigation Recommendations
Upgrade Sync-in Server to version 2.2.0 or later, where this timing discrepancy vulnerability has been patched. Since this is an open-source product and not a cloud service, applying the official update is the recommended remediation. Patch status is confirmed by the vendor's versioning information.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-17T16:34:45.524Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fde35acbff5d8610d89550
Added to database: 05/08/2026, 13:21:30 UTC
Last enriched: 05/16/2026, 10:50:34 UTC
Last updated: 07/04/2026, 08:51:23 UTC
Views: 92
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