CVE-2026-58269

High

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.

SeverityHigh

CVSS8.1

Exploit probability—

Product@sync-in/server

PublishedSep 21, 2026

First seenSep 21, 2026

Weakness typeCWE-288CWE-288

How to fix

Update

@sync-in/server2.4.0 or later

Affected products

Product	Affected versions	Fixed in
@sync-in/servernpm	v < 2.4.0	2.4.0

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