---
id: CVE-2025-59843
title: Flag Forge is a Capture The Flag (CTF) platform
summary: >-
  Flag Forge is a Capture The Flag (CTF) platform. From versions 2.0.0 to before
  2.3.2, the public endpoint /api/user/[username] returns user email addresses
  in its JSON response. The fix, intended for release in 2.3.1 but only
  available s…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-359
vendor: flagforge
product: flagforge
affected:
  - 'flagforge >= 2.0, < 2.3.1'
patched:
  - flagforge 2.3.1
published: '2025-09-26'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T10:10:00.193'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-59843'
references:
  - url: >-
      https://github.com/FlagForgeCTF/flagForge/commit/1b033f1b6e20fbf6df422d5d1afc9b2347528ace
    label: security-advisories@github.com
  - url: 'https://github.com/FlagForgeCTF/flagForge/compare/v2.3.1...v2.3.2'
    label: security-advisories@github.com
  - url: 'https://github.com/FlagForgeCTF/flagForge/releases/tag/v2.3.1'
    label: security-advisories@github.com
  - url: >-
      https://github.com/FlagForgeCTF/flagForge/security/advisories/GHSA-qqjv-8r5p-7xpj
    label: security-advisories@github.com
tags:
  - nvd
  - exploit-available
epss: 0.00414
epssPercentile: 0.33623
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/At0mXploit/CVE-2025-59843-CVE-2025-59932'
  checkedAt: '2026-10-09T12:54:06.032Z'
exploitAvailable: true
ingestedAt: '2026-10-09T12:53:27.760Z'
---

## Overview

Flag Forge is a Capture The Flag (CTF) platform. From versions 2.0.0 to before 2.3.2, the public endpoint /api/user/[username] returns user email addresses in its JSON response. The fix, intended for release in 2.3.1 but only available starting in version 2.3.2, removes email addresses from public API responses while keeping the endpoint publicly accessible. Users should upgrade to version 2.3.2 or later to eliminate exposure. There are no workarounds for this vulnerability.

## Affected

- `flagforge >= 2.0, < 2.3.1`

## Remediation

Upgrade past the affected range:

- `flagforge 2.3.1`