Draft:Flagforge

FlagForge
DeveloperFlagForgeCTF (community contributors)
Written inTypeScript
Operating systemCross-platform (web application)
LicenseGPL-3.0
Repositoryhttps://github.com/FlagForgeCTF/flagForge

FlagForge is an open-source capture-the-flag (CTF) platform for hosting and participating in challenge-based cybersecurity exercises. According to its public repository documentation, it provides participant accounts, challenge listings, flag submission, and a leaderboard for scoring.[1] The project is developed publicly on GitHub and released as tagged versions (for example, a “v2.3.3” release is listed on the repository’s releases page).[2]

The platform has also been referenced in vulnerability databases in connection with disclosed security issues affecting certain versions of the software.[3][4]

History and development

FlagForge is maintained as an open-source project on GitHub under the FlagForgeCTF organization.[1] The repository lists the software as licensed under GPL-3.0 and implemented primarily in TypeScript.[1] Public releases are distributed through GitHub’s release tagging mechanism.[2]

Features

Repository documentation describes FlagForge as providing the core functions typical of a CTF event platform, challenge hosting, flag submission, and progress tracking through a web interface.[1] These features are commonly used to support jeopardy-style CTF formats where participants solve independent challenges to gain points and appear on a leaderboard.[5]

Independent user-generated walkthroughs have described solving individual FlagForge challenges (for example, reverse engineering and network forensics challenge writeups published on Medium).[6][7][8]

Security

Vulnerability disclosures and database entries have documented security issues in specific FlagForge versions.

  • Privilege escalation (CVE-2025-59827): NVD describes an access-control issue in version 2.1.0 involving an administrative badge-assignment endpoint, allowing an authenticated user to assign high-privilege badges to themselves; the entry states the issue was patched in version 2.2.0.[9]
  • Session invalidation (CVE-2025-59841): NVD reports that versions 2.2.0 to before 2.3.1 did not properly invalidate sessions on logout, allowing continued access to protected endpoints and leaving CSRF tokens valid; the issue is described as patched in 2.3.1.[3] A Positive Technologies dbugs entry also summarizes the same issue and lists affected versions and an upgrade recommendation.[4]
  • Exposure of email addresses (CVE-2025-59843): NVD describes a public API endpoint returning user email addresses in JSON responses in versions 2.0.0 to before 2.3.1, and states the issue was patched in version 2.3.1 by removing email addresses from public responses.[10]
  • Hint exposure (CVE-2025-59833): NVD describes an issue where an API endpoint could return hints for challenges without requiring completion, and states it was patched in version 2.2.1.[11]

See also

References

  1. ^ a b c d "Flagforge (README)". GitHub. Retrieved 7 January 2026.
  2. ^ a b "FlagForge v2.3.3 – Patch Release (GitHub release listing)". GitHub. Retrieved 7 January 2026.
  3. ^ a b "CVE-2025-59841 Detail". National Vulnerability Database (NVD). U.S. National Institute of Standards and Technology (NIST). Retrieved 7 January 2026.
  4. ^ a b "PT-2025-39418 (CVE-2025-59841) — Flagforge". dbugs (Positive Technologies). Retrieved 7 January 2026.
  5. ^ "Capture the flag (cybersecurity)". Wikipedia. Retrieved 7 January 2026.
  6. ^ "Cracking the Binary: My Reverse Engineering Journey in FlagForge CTF". Medium. 14 April 2025. Retrieved 7 January 2026.
  7. ^ "CTF Challenge: Flag Forge — PCAP Analysis". Medium. 31 March 2025. Retrieved 7 January 2026.
  8. ^ "CTF Challenge: FlagForge — Solving the InjectMe SQL Injection". Medium. 7 April 2025. Retrieved 7 January 2026.
  9. ^ "CVE-2025-59827 Detail". National Vulnerability Database (NVD). NIST. Retrieved 7 January 2026.
  10. ^ "CVE-2025-59843 Detail". National Vulnerability Database (NVD). NIST. Retrieved 7 January 2026.
  11. ^ "CVE-2025-59833 Detail". National Vulnerability Database (NVD). NIST. Retrieved 7 January 2026.
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