# CVE-2026-53958

## Summary

- **CVE ID:** CVE-2026-53958
- **Severity:** HIGH
- **CVSS Score:** 7.6 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L)
- **CWE:** CWE-287, CWE-915
- **Published:** Aug 18, 2026
- **Last Modified:** Aug 19, 2026

## Description

4gaBoards is a boards system for realtime project management. Prior to 3.3.9, 4gaBoards allows an authenticated user to modify ssoGoogleId, ssoGoogleEmail, ssoGithubId, ssoGithubUsername, ssoGithubEmail, ssoMicrosoftId, ssoMicrosoftEmail, ssoOidcId, and ssoOidcEmail through PATCH /api/users/:id. The whitelist in server/api/controllers/users/update.js mass assigns these backend-managed identity attributes from user input. An attacker can place a victim's provider identifier on an attacker-controlled account, causing the default lookup in helpers such as server/api/helpers/users/get-create-one-for-github-sso.js to match the victim's first SSO login to the attacker's account before the email-linkage flow runs. The victim is logged into the attacker-controlled account, and projects, boards, or data the victim creates remain accessible through the attacker's original local credentials. This issue is fixed in version 3.3.9.

## Affected Products

- RARgames — 4gaBoards (< 3.3.9)

## References

- [CNA](https://github.com/RARgames/4gaBoards/security/advisories/GHSA-j2fw-r2gj-hfr3)
- [CNA](https://github.com/RARgames/4gaBoards/commit/7a79f4c5d338614058515752abd67e49ee2818bb)
- [CNA](https://github.com/RARgames/4gaBoards/releases/tag/v3.3.9)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.35%
- **EPSS Percentile:** 28.5

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._