CVE-2026-58272

5.3 MEDIUMpublic exploit available

Published 2026-09-21 · Updated 2026-09-21

AI risk analysis

Summary: The flaw in Sync-in Server allows unauthenticated attackers to measure response times and enumerate valid usernames or email addresses, enabling credential-stuffing attacks.
Exploitability: Exploitation is relatively easy as it requires no authentication but depends on network latency measurement capabilities.
Blast radius: If exploited, this could lead to unauthorized access attempts and successful credential enumeration for legitimate users.
Prioritized remediation: Update to Sync-in Server version 2.4.1 or later to apply the necessary patch.

auth-bypassenumerationweb

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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 vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Weaknesses

CWE-208

Public exploit & PoC references

https://github.com/Sync-in/server/security/advisories/GHSA-29hq-23m2-2j47

All references

https://github.com/Sync-in/server/security/advisories/GHSA-29hq-23m2-2j47

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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