https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-07T20:30:42.056566+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/euvd-2026-310036 EUVD-2026-310036 2026-10-07T20:30:42.107287+00:00 EUVD-2026-310036 https://cve.radiocsirt.org/vuln/fkie_cve-2026-41161 fkie_cve-2026-41161 2026-10-07T20:30:42.107328+00:00

Sync-in Server is a secure, open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.2.0, the /api/auth/login endpoint contains a logic flaw that allows unauthenticated remote attackers to enumerate valid usernames by measuring the application's response time. This issue has been patched in version 2.2.0.

 https://cve.radiocsirt.org/vuln/ghsa-43fj-qp3h-hrh5 GHSA-43fj-qp3h-hrh5 — Sync-in Server has Username Enumeration via Timing Attack 2026-10-07T20:30:42.107363+00:00

Affected: npm: @sync-in/server

### Summary The `/api/auth/login` endpoint contains a logic flaw that allows unauthenticated remote attackers to enumerate valid usernames by measuring the application's response time.

### Details The logic flaw can be located at the below point in source: https://github.com/Sync-in/server/blob/7868bb2b3025f92e6c38087456304758713971b2/backend/src/applications/users/services/users-queries.service.ts#L91-L95

Endpoints used for authentication should respond to the user with a consistent cadence, preventing remote actors from deriving sensitive information about an application based on backend behavior. In the case of authentication endpoints, this timing discrepancy is often caused by short-circuiting due to the lack of a matched user to compare against - as is the case with Sync-in.

### Validation TickTock Enum (Burp Suite Extension) was utilized to validate this finding. Authentication attempts with a valid username see a response from the application at around 350-400ms on average, while invalid usernames are returned at only 95-100ms on average. <img width="1302" height="284" alt="image" src="https://github.com/user-attachments/assets/31eeb72a-c3c2-4057-ac69-c0c92f0bbd4e" />

### Impact An unauthenticated remote attacker can enumerate valid usernames. This significantly weakens the application's security posture by facilitating targeted brute-force attacks, stuffing, social engineering, and a suite of other more targeted attacks.