CVE-2026-58272: CWE-208: Observable Timing Discrepancy in Sync-in server
Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Versions prior to 2.4.1 contain an observable timing discrepancy in the login endpoint because authentication attempts for nonexistent accounts return without performing the bcrypt comparison used for existing accounts. An unauthenticated attacker can measure response times to enumerate valid usernames or email addresses, facilitating credential-stuffing, password-spraying, and phishing attacks. Version 2.4.1 contains a patch.
AI Analysis
Technical Summary
CVE-2026-58272 describes a timing discrepancy vulnerability in Sync-in Server's login endpoint affecting versions before 2.4.1. The flaw arises because the server returns responses for nonexistent accounts faster than for existing accounts due to skipping bcrypt password hash comparisons. This timing difference allows unauthenticated attackers to enumerate valid user identifiers by measuring response times. The vulnerability is classified under CWE-208 (Observable Timing Discrepancy). The issue is fixed in version 2.4.1.
Potential Impact
The vulnerability enables unauthenticated attackers to enumerate valid usernames or email addresses by observing response time differences during login attempts. This information disclosure can facilitate targeted credential-stuffing, password-spraying, and phishing attacks. The confidentiality impact is low, with no direct impact on integrity or availability reported.
Mitigation Recommendations
Upgrade Sync-in Server to version 2.4.1 or later, which contains an official patch addressing the timing discrepancy vulnerability. No additional mitigation is required once the patch is applied.
CVE-2026-58272: CWE-208: Observable Timing Discrepancy in Sync-in server
Description
Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Versions prior to 2.4.1 contain an observable timing discrepancy in the login endpoint because authentication attempts for nonexistent accounts return without performing the bcrypt comparison used for existing accounts. An unauthenticated attacker can measure response times to enumerate valid usernames or email addresses, facilitating credential-stuffing, password-spraying, and phishing attacks. Version 2.4.1 contains a patch.
CVSS v3.1
Score 5.3medium
Affected software
Sync-in
server
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-58272 describes a timing discrepancy vulnerability in Sync-in Server's login endpoint affecting versions before 2.4.1. The flaw arises because the server returns responses for nonexistent accounts faster than for existing accounts due to skipping bcrypt password hash comparisons. This timing difference allows unauthenticated attackers to enumerate valid user identifiers by measuring response times. The vulnerability is classified under CWE-208 (Observable Timing Discrepancy). The issue is fixed in version 2.4.1.
Potential Impact
The vulnerability enables unauthenticated attackers to enumerate valid usernames or email addresses by observing response time differences during login attempts. This information disclosure can facilitate targeted credential-stuffing, password-spraying, and phishing attacks. The confidentiality impact is low, with no direct impact on integrity or availability reported.
Mitigation Recommendations
Upgrade Sync-in Server to version 2.4.1 or later, which contains an official patch addressing the timing discrepancy vulnerability. No additional mitigation is required once the patch is applied.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-29T21:54:30.332Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab197cf55bf5e2cf5736874
Added to database: 09/21/2026, 20:47:11 UTC
Last enriched: 09/21/2026, 21:01:52 UTC
Last updated: 09/21/2026, 22:11:59 UTC
Views: 5
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.