CVE-2026-58269
8.1 HIGHpublic exploit availablePublished 2026-09-21 · Updated 2026-09-24
AI risk analysis
- Summary
- The flaw allows an attacker to bypass two-factor authentication (2FA) by exploiting the `POST /api/auth/token` endpoint, which returns full access tokens without checking 2FA status.
- Exploitability
- Exploitation is relatively easy if an attacker has stolen or phished credentials, as 2FA is bypassed in a single request.
- Blast radius
- If exploited, the attacker gains full access to the user's account, potentially leading to data theft or unauthorized actions.
- Detection
- No reliable host or network indicator is derivable from the published description.
- Prioritized remediation
- Upgrade to version 2.4.0 or later.
Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.
NVD 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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weaknesses
CWE-288
Public exploit & PoC references
References
Data: NVD (public domain). Analysis: local $0 model. Defensive use only.