What’s Vulnerable › Vulnerabilities
CVE-2025-59833: FlagForgeCTF Hint Exposure via API
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-09-24 · updated 2026-06-17
- Weakness: CWE-200
Description
Flag Forge is a Capture The Flag (CTF) platform. In versions from 2.1.0 to before 2.3.0, the API endpoint GET /api/problems/:id returns challenge hints in plaintext within the question object, regardless of whether the user has unlocked them via point deduction. Users can view all hints for free, undermining the business logic of the platform and reducing the integrity of the challenge system. This issue has been patched in version 2.3.0.
Affected products
- FlagForgeCTF flagForge: from 2.1.0 before 2.3 — fixed in 2.3
How to fix
Upgrade to a fixed version: FlagForgeCTF flagForge 2.3. Check the vendor advisory for mitigations.
References
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