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CVE-2026-58269— Sync-in Server has a complete 2FA Bypass via `POST /api/auth/token`

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. Prior to version 2.4.0, authenticates with username and password only, then calls , which returns full access and refresh JWTs without checking whether the account

CVSS 8.1 · High EPSS 0.22% · P13
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I. Basic Information for CVE-2026-58269

Vulnerability Information

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Vulnerability Title
Sync-in Server has a complete 2FA Bypass via `POST /api/auth/token`
Source: CVE Program / CVE List V5
Vulnerability Description
Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.4.0, `POST /api/auth/token` authenticates with username and password only, then calls `getTokens()`, which returns full access and refresh JWTs without checking whether the account has TOTP 2FA enabled. An attacker with stolen or phished credentials can bypass 2FA in a single request. The parallel login endpoint (`POST /api/auth/login`) correctly enforces 2FA by calling `setCookies(user, res, true)`, which gates on `user.twoFaEnabled`. Version 2.4.0 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选路径或通道进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Sync-in server < 2.4.0 -

II. Public POCs for CVE-2026-58269

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III. Intelligence Information for CVE-2026-58269

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Other References for CVE-2026-58269 (1)

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

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`
CVE-2026-58272 5.3 MEDIUM Sync-in Server has Username/Login Enumeration via Timing Side-Channel on POST /api/auth/lo

IV. Related Vulnerabilities

Same product: server
Same vendor: Sync-in
Same weakness: CWE-288

V. Comments for CVE-2026-58269

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