CVE-2026-58271
CVE-2026-58271 · @sync-in/server vulnerable to TOTP Brute-Force via `POST /api/app/sync/register`
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.4.0, `POST /api/app/sync/register` accepts credentials and a TOTP code to register a desktop sync client. On a failed TOTP, `SyncClientsManager.register()` calls `updateAccesses(user, ip, false)`, which hits a freeze branch that writes `passwordAttempts` back unchanged. The counter never reaches `USER_MAX_PASSWORD_ATTEMPTS` (10) and the lockout gate never fires. A successful guess returns a `{clientId, clientToken}` pair. The token can be exchanged via `POST /api/app/sync/auth/cookie` for a full JWT. While the code is valid, the attacker can also call `POST /api/auth/2fa/disable` to permanently remove MFA. Version 2.4.0 patches the issue.
CVSS 6.8 · Medium · EPSS 0.2% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
server
- Versions
- < 2.4.0: Affected
No fix published
@sync-in/server npm
- Affected ranges
- SEMVER: < 2.4.0
Update to 2.4.0