CVE-2026-58269
Sync-in Server has a complete 2FA Bypass via `POST /api/auth/token`
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-288 |
| Vendor | sync-in |
| Product | server |
| Published | Sep 21, 2026 |
Stay Ahead of the Next One
Get instant alerts for sync-in server
Be the first to know when new high vulnerabilities affecting sync-in server are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
Sync-in / server
< 2.4.0