What’s Vulnerable › Vulnerabilities

CVE-2026-58269: Sync-in Server has a complete 2FA Bypass via `POST /api/auth/token`

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-21 · updated 2026-09-24
• Weakness: CWE-288

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.

Affected products

• Sync-in server: before 2.4.0

References

• https://github.com/Sync-in/server/security/advisories/GHSA-92cr-jxw4-5wjg
• https://github.com/Sync-in/server/security/advisories/GHSA-92cr-jxw4-5wjg

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