Information Disclosure in Flag Forge CTF Platform
CVE-2025-59833

7.5HIGH

Key Information:

Vendor

Flagforgectf

Status
Flagforge
Vendor
CVE Published:
24 September 2025

What is CVE-2025-59833?

Flag Forge, a popular Capture The Flag (CTF) platform, suffers from a significant vulnerability that allows users to access challenge hints through the API endpoint GET /api/problems/:id. This security flaw exists in versions from 2.1.0 to prior to 2.3.0, where hints are returned in plaintext, exposing sensitive information irrespective of a user's progress or point deductions. This compromises the integrity of the challenge system and undermines the platform's business logic. The vulnerability has been resolved in version 2.3.0, making it essential for users to upgrade to the latest version to ensure their environments remain secure.

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Affected Version(s)

flagForge >= 2.1.0, < 2.3.0

References

https://github.com/FlagForgeCTF/flagForge/security/adviso...
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CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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