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OpenAdvisories
Medium · 6.9 Public exploit CVE-2025-59843 EUVD-2025-31370

FlagForgeCTF Exposes User Emails via Public /api/user/[username] API

Published Sep 26, 2025 · Updated Jan 28, 2026 · Assigned by GitHub_M

Vendor: FlagForgeCTF Product: flagForge

Description

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 products

VendorProductAffectedFixed
FlagForgeCTF flagForge >= 2.0.0, < 2.3.2 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References