CVE-2026-58269: high-severity vulnerability in Sync-in server
Sync-in Server has a complete 2FA Bypass via `POST /api/auth/token`
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.1epss 0.3%
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Affected products
Sync-in · serverRelated CVEs — Sync-in server
In the same product, most dangerous first.
CVE-2026-58270MEDIUMSync-in Server has a ReDoS via Unsanitized Regex in Sync Diff `pathFilters`EPSS 0.4%CVE-2026-58272MEDIUMSync-in Server has Username/Login Enumeration via Timing Side-Channel on POST /api/auth/login (incomplete fix of the prior timing-attack advisory)EPSS 0.4%CVE-2026-41161MEDIUMUsername Enumeration via Timing AttackEPSS 0.3%CVE-2026-47684HIGHSync-in Server: SSRF protection bypass via IPv4-mapped IPv6 addresses in regExpPrivateIPEPSS 0.2%CVE-2026-58271MEDIUM@sync-in/server vulnerable to TOTP Brute-Force via `POST /api/app/sync/register`EPSS 0.2%