CVE-2026-53959 4gaBoards: Mass Information Disclosure (Internal PII Leakage) on /api/users to any authenticated user
Authenticated users can access sensitive personal information of all other users via unprotected API endpoints, enabling privacy loss and phishing.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-53959?
CVE-2026-53959 is a medium-severity vulnerability in RARgames 4gaBoards, published on 18 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
4gaBoards is a boards system for realtime project management. Prior to 3.3.9, 4gaBoards allows any authenticated user to enumerate account information for every user through GET /api/users and retrieve arbitrary accounts through GET /api/users/:id. The users/index and users/show actions rely only on the default is-authenticated policy in server/config/policies.js, and server/api/controllers/users/index.js returns the result of sails.helpers.users.getMany() without requester-specific authorization or response sanitization. Responses expose email, phone, organization, name, isAdmin, ssoGoogleEmail, ssoGithubEmail, and other SSO-linked email fields, including data for administrators. This enables instance-wide user enumeration, privacy loss, and targeted phishing reconnaissance. This issue is fixed in version 3.3.9.
Weakness: CWE-200
Which versions are affected by CVE-2026-53959?
How do I fix CVE-2026-53959?
No fix has been published for CVE-2026-53959 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-53959 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-53959 exists.
Public exploit code: 1 Metasploit module and 1 proofs of concept on GitHub.
Sources
Also known as GHSA-p77f-p47g-h72p.