# CVE-2026-53958 — RARgames 4gaBoards

> As of 2026-08-19, CVE-2026-53958 is a HIGH-severity vulnerability in RARgames 4gaBoards, CVSS v3.1 7.6, EPSS 0.2% (20.3th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-53958 as of 2026-08-19; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-19

## What is CVE-2026-53958?

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.

The record classifies CVE-2026-53958 under weakness classes [CWE-287](https://intel.threadlinqs.com/cwe/CWE-287), [CWE-915](https://cwe.mitre.org/data/definitions/915.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs a user to take an action first, and has high impact on confidentiality, integrity. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 48 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.6 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 20.3% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-18, last modified 2026-08-19

## Is CVE-2026-53958 being exploited?

It currently carries a trending score of 35 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **RARgames**: 4gaBoards

## How to fix CVE-2026-53958

No vendor patch reference has been recorded for CVE-2026-53958 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-53958

No threat campaign in the Threadlinqs corpus currently references CVE-2026-53958, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-08-20. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/RARgames/4gaBoards/security/advisories/GHSA-j2fw-r2gj-hfr3)

**Other references**

- [github.com](https://github.com/RARgames/4gaBoards/commit/7a79f4c5d338614058515752abd67e49ee2818bb)
- [github.com (v3.3)](https://github.com/RARgames/4gaBoards/releases/tag/v3.3.9)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-53958
Full detection coverage and IOCs for threats exploiting CVE-2026-53958 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp