CVE-2025-59843 MEDIUM

CVE-2025-59843: FlagForgeCTF Exposes User Emails via Public /api/user/[username] API

Vendor Flagforgectf
Product flagForge
Weakness CWE-359
Published September 26, 2025
Last update January 28, 2026

CVSS base score

6.9/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

September 26, 2025 CVE published
January 28, 2026 Record updated