CVE-2026-58271Medium· 6.8▾ TwilightPoC availableSync-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 TOT…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 37.4 · likelihood 0 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 23.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.2%
Last analysed / modified upstream
0.2% → 0.3%
Exploit / PoC code exists
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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
@sync-in/server <= 2.3.0Patched in:
@sync-in/server 2.4.0Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-58270Medium· 6.5Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing
CVE-2026-58269High· 8.1Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing
CVE-2026-58272Medium· 5.3Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing
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