Sync-in server up to 2.4.0 Login Endpoint timing discrepancy

Summaryinfo

A vulnerability categorized as problematic has been discovered in Sync-in server up to 2.4.0. This affects an unknown function of the component Login Endpoint. Executing a manipulation can lead to timing discrepancy. This vulnerability is tracked as CVE-2026-58272. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Sync-in server up to 2.4.0 and classified as problematic. This vulnerability affects an unknown functionality of the component Login Endpoint. The manipulation with an unknown input leads to a timing discrepancy vulnerability. The CWE definition for the vulnerability is CWE-208. Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-58272 since 06/29/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 2.4.1 eliminates this vulnerability.

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Productinfo

Vendor

• Sync-in

Name

• server

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4.0

Website

• Product: https://github.com/Sync-in/server/

CPE 2.3info

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CPE 2.2info

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