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CVE-2026-58272— Sync-in Server has Username/Login Enumeration via Timing Side-Channel on POST /api/auth/login (incomplete fix of the prior timing-attack advisory)

Quick assessment

Affected
Sync-in server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 perf

CVSS 5.3 · Medium EPSS 0.29% · P21

Affected Version Matrix 1

VendorProduct Version RangeStatus
Sync-in server < 2.4.1 affected
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I. Basic Information for CVE-2026-58272

Vulnerability Information

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Vulnerability Title
Sync-in Server has Username/Login Enumeration via Timing Side-Channel on POST /api/auth/login (incomplete fix of the prior timing-attack advisory)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Sync-in server < 2.4.1 -

II. Public POCs for CVE-2026-58272

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III. Intelligence Information for CVE-2026-58272

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Other References for CVE-2026-58272 (1)

Same Patch Batch · Sync-in · 2026-09-21 · 4 CVEs total

CVE-2026-58269 8.1 HIGH Sync-in Server has a complete 2FA Bypass via `POST /api/auth/token`
CVE-2026-58271 6.8 MEDIUM @sync-in/server vulnerable to TOTP Brute-Force via `POST /api/app/sync/register`
CVE-2026-58270 6.5 MEDIUM Sync-in Server has a ReDoS via Unsanitized Regex in Sync Diff `pathFilters`

IV. Related Vulnerabilities

Same product: server
Same vendor: Sync-in
Same weakness: CWE-208

V. Comments for CVE-2026-58272

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